diff --git a/ChangeLog b/ChangeLog
index 0a4ed8988..0dfc1fc65 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,46 @@
+2003-08-15  Alexandre Duret-Lutz  <adl@gnu.org>
+
+	This implements Couvreur's FM'99 ltl2tgba translation.
+	* src/tgba/bdddict.cc (bdd_dict::is_registered): Split as ...
+	(bdd_dict::is_registered_proposition, bdd_dict::is_registered_state,
+	bdd_dict::is_registered_accepting_variable): ... these.
+	* src/tgba/bdddict.hh: Likewise.
+	* src/tgba/tgbaexplicit.cc (tgba_explicit::set_init_state): New method.
+	(tgba_explicit::declare_accepting_condition): Arrange so that this
+	function can be called during the construction of the automaton.
+	(tgba_explicit::complement_all_accepting_conditions): New method.
+	(tgba_explicit::has_accepting_condition): Adjust to call
+	bdd_dict::is_registered_accepting_variable.
+	* src/tgba/tgbaexplicit.hh (tgba_explicit::set_init_state,
+	tgba_explicit::complement_all_accepting_conditions): New methods.
+	* src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/ltl2tgba_fm.hh:
+	New files.
+	* src/tgbaalgos/Makefile.am (tgbaalgos_HEADERS,
+	libtgbaalgos_la_SOURCES): Add them.
+	* src/tgbaalgos/ltl2tgba.hh: Add bibtex entry in comment.
+	* src/tgbatest/Makefile.am (check_PROGRAMS): Remove spotlbtt
+	and tbalbtt.
+	(tbalbtt_SOURCES, tbalbtt_CXXFLAGS, spotlbtt_SOURCES): Remove.
+	* src/tgbatest/spotlbtt.cc: Delete, superseded by "ltl2tgba -F -t".
+	* src/tgbatest/ltl2tgba.cc: Implement the -f and -F options.
+	* src/tgbatest/spotlbtt.test: Use "ltl2tgba -F -t" instead of
+	"spotlbtt", "ltl2tgba -F -t -D" instead of "tbalbtt", and add
+	also check the ltl2tgba_fm translator.
+	* wrap/python/spot.i: Wrap ltl2tgba_fm.
+	* wrap/python/cgi/ltl2tgba.in: Add radio buttons to select
+	between ltl2tgba and ltl2tgba_fm.
+	* wrap/python/tests/ltl2tgba.py: Add support for the -f option.
+	* wrap/python/tests/ltl2tgba.test: Try the -f option.
+
+	varnum can be augmented by other allocator.  Keep track
+	of a local varnum (lvarnum) in each allocator.
+	* src/misc/bddalloc.cc (bdd_allocator::bdd_allocator): Initialize
+	lvarnum.
+	(bdd_allocator::extvarnum): New method.
+	(bdd_allocator::allocate_variables): Use lvarnum and extvarnum.
+	* src/misc/bddalloc.hh (bdd_allocator::extvarnum): New mathod.
+	(bdd_allocator::lvarnum): New variable.
+
 2003-08-14  Alexandre Duret-Lutz  <aduret@src.lip6.fr>
 
 	* src/tgba/state.hh, src/tgba/statebdd.hh, src/tgba/statebdd.cc:
diff --git a/src/tgba/bdddict.cc b/src/tgba/bdddict.cc
index 38115ca80..5a344690e 100644
--- a/src/tgba/bdddict.cc
+++ b/src/tgba/bdddict.cc
@@ -161,30 +161,33 @@ namespace spot
   }
 
   bool
-  bdd_dict::is_registered(const ltl::formula* f, const void* by_me)
+  bdd_dict::is_registered_proposition(const ltl::formula* f, const void* by_me)
   {
-    int var;
     fv_map::iterator fi = var_map.find(f);
-    if (fi != var_map.end())
-      {
-	var = fi->second;
-      }
-    else
-      {
-	fi = now_map.find(f);
-	if (fi != now_map.end())
-	  {
-	    var = fi->second;
-	  }
-	else
-	  {
-	    fi = acc_map.find(f);
-	    if (fi == acc_map.end())
-	      return false;
-	    var = fi->second;
-	  }
-      }
-    ref_set& s = var_refs[var];
+    if (fi == var_map.end())
+      return false;
+    ref_set& s = var_refs[fi->second];
+    return s.find(by_me) != s.end();
+  }
+
+  bool
+  bdd_dict::is_registered_state(const ltl::formula* f, const void* by_me)
+  {
+    fv_map::iterator fi = now_map.find(f);
+    if (fi == now_map.end())
+      return false;
+    ref_set& s = var_refs[fi->second];
+    return s.find(by_me) != s.end();
+  }
+
+  bool
+  bdd_dict::is_registered_accepting_variable(const ltl::formula* f,
+					     const void* by_me)
+  {
+    fv_map::iterator fi = acc_map.find(f);
+    if (fi == acc_map.end())
+      return false;
+    ref_set& s = var_refs[fi->second];
     return s.find(by_me) != s.end();
   }
 
diff --git a/src/tgba/bdddict.hh b/src/tgba/bdddict.hh
index 4edc8606d..b54bbfbfb 100644
--- a/src/tgba/bdddict.hh
+++ b/src/tgba/bdddict.hh
@@ -91,8 +91,13 @@ namespace spot
     /// Usually called in the destructor if \a me.
     void unregister_all_my_variables(const void* me);
 
+    /// @{
     /// Check whether formula \a f has already been registered by \a by_me.
-    bool is_registered(const ltl::formula* f, const void* by_me);
+    bool is_registered_proposition(const ltl::formula* f, const void* by_me);
+    bool is_registered_state(const ltl::formula* f, const void* by_me);
+    bool is_registered_accepting_variable(const ltl::formula* f,
+					  const void* by_me);
+    /// @}
 
     /// \brief Dump all variables for debugging.
     /// \param os The output stream.
diff --git a/src/tgba/tgbaexplicit.cc b/src/tgba/tgbaexplicit.cc
index b490dabaf..a78e34da0 100644
--- a/src/tgba/tgbaexplicit.cc
+++ b/src/tgba/tgbaexplicit.cc
@@ -111,6 +111,7 @@ namespace spot
 	state_name_map_[s] = name;
 
 	// The first state we add is the inititial state.
+	// It can also be overridden with set_init_state().
 	if (! init_)
 	  init_ = s;
 
@@ -119,6 +120,14 @@ namespace spot
     return i->second;
   }
 
+  void
+  tgba_explicit::set_init_state(const std::string& state)
+  {
+    tgba_explicit::state* s = add_state(state);
+    init_ = s;
+  }
+
+
   tgba_explicit::transition*
   tgba_explicit::create_transition(const std::string& source,
 				   const std::string& dest)
@@ -159,13 +168,40 @@ namespace spot
   {
     int v = dict_->register_accepting_variable(f, this);
     ltl::destroy(f);
-    neg_accepting_conditions_ &= bdd_nithvar(v);
+    bdd neg = bdd_nithvar(v);
+    neg_accepting_conditions_ &= neg;
+
+    // Append neg to all acceptance conditions.
+    ns_map::iterator i;
+    for (i = name_state_map_.begin(); i != name_state_map_.end(); ++i)
+      {
+	tgba_explicit::state::iterator i2;
+	for (i2 = i->second->begin(); i2 != i->second->end(); ++i2)
+	  (*i2)->accepting_conditions &= neg;
+      }
+
+    all_accepting_conditions_computed_ = false;
+  }
+
+  void
+  tgba_explicit::complement_all_accepting_conditions()
+  {
+    bdd all = all_accepting_conditions();
+    ns_map::iterator i;
+    for (i = name_state_map_.begin(); i != name_state_map_.end(); ++i)
+      {
+	tgba_explicit::state::iterator i2;
+	for (i2 = i->second->begin(); i2 != i->second->end(); ++i2)
+	  {
+	    (*i2)->accepting_conditions = all - (*i2)->accepting_conditions;
+	  }
+      }
   }
 
   bool
   tgba_explicit::has_accepting_condition(ltl::formula* f) const
   {
-    return dict_->is_registered(f, this);
+    return dict_->is_registered_accepting_variable(f, this);
   }
 
   bdd
@@ -185,6 +221,9 @@ namespace spot
 	assert(0);
       }
     bdd_dict::fv_map::iterator i = dict_->acc_map.find(f);
+    assert(has_accepting_condition(f));
+    /* If this second assert fails and the first doesn't,
+       things are badly broken.  This has already happened. */
     assert(i != dict_->acc_map.end());
     ltl::destroy(f);
     bdd v = bdd_ithvar(i->second);
diff --git a/src/tgba/tgbaexplicit.hh b/src/tgba/tgbaexplicit.hh
index 74be2164b..3138a6762 100644
--- a/src/tgba/tgbaexplicit.hh
+++ b/src/tgba/tgbaexplicit.hh
@@ -29,6 +29,8 @@ namespace spot
       state* dest;
     };
 
+    void set_init_state(const std::string& state);
+
     transition*
     create_transition(const std::string& source, const std::string& dest);
 
@@ -37,6 +39,7 @@ namespace spot
     void declare_accepting_condition(ltl::formula* f);
     bool has_accepting_condition(ltl::formula* f) const;
     void add_accepting_condition(transition* t, ltl::formula* f);
+    void complement_all_accepting_conditions();
 
     // tgba interface
     virtual ~tgba_explicit();
diff --git a/src/tgbaalgos/Makefile.am b/src/tgbaalgos/Makefile.am
index 1f6d9dd24..ba679469e 100644
--- a/src/tgbaalgos/Makefile.am
+++ b/src/tgbaalgos/Makefile.am
@@ -8,6 +8,7 @@ tgbaalgos_HEADERS = \
   dotty.hh \
   lbtt.hh \
   ltl2tgba.hh \
+  ltl2tgba_fm.hh \
   magic.hh \
   save.hh
 
@@ -17,5 +18,6 @@ libtgbaalgos_la_SOURCES = \
   dotty.cc \
   lbtt.cc \
   ltl2tgba.cc \
+  ltl2tgba_fm.cc \
   magic.cc \
   save.cc
diff --git a/src/tgbaalgos/ltl2tgba.hh b/src/tgbaalgos/ltl2tgba.hh
index 3b38bf12e..0e6999e69 100644
--- a/src/tgbaalgos/ltl2tgba.hh
+++ b/src/tgbaalgos/ltl2tgba.hh
@@ -7,6 +7,23 @@
 namespace spot
 {
   /// Build a spot::tgba_bdd_concrete from an LTL formula.
+  ///
+  /// This is based on the following paper.
+  /// \verbatim
+  /// @InProceedings{   couvreur.00.lacim,
+  ///   author        = {Jean-Michel Couvreur},
+  ///   title         = {Un point de vue symbolique sur la logique temporelle
+  ///                   lin{\'e}aire},
+  ///   booktitle     = {Actes du Colloque LaCIM 2000},
+  ///   month         = {August},
+  ///   year          = {2000},
+  ///   pages         = {131--140},
+  ///   volume        = {27},
+  ///   series        = {Publications du LaCIM},
+  ///   publisher     = {Universit{\'e} du Qu{\'e}bec {\`a} Montr{\'e}al},
+  ///   editor        = {Pierre Leroux}
+  /// }
+  /// \endverbatim
   tgba_bdd_concrete* ltl_to_tgba(const ltl::formula* f, bdd_dict* dict);
 }
 
diff --git a/src/tgbaalgos/ltl2tgba_fm.cc b/src/tgbaalgos/ltl2tgba_fm.cc
new file mode 100644
index 000000000..e0af72eca
--- /dev/null
+++ b/src/tgbaalgos/ltl2tgba_fm.cc
@@ -0,0 +1,483 @@
+#include "misc/bddalloc.hh"
+#include "ltlast/visitor.hh"
+#include "ltlast/allnodes.hh"
+#include "ltlvisit/lunabbrev.hh"
+#include "ltlvisit/nenoform.hh"
+#include "ltlvisit/destroy.hh"
+#include "ltlvisit/tostring.hh"
+#include <cassert>
+
+#include "tgba/tgbabddconcretefactory.hh"
+#include "ltl2tgba_fm.hh"
+
+namespace spot
+{
+  using namespace ltl;
+
+  namespace
+  {
+
+    // Helper dictionary.  We represent formula using a BDD to simplify
+    // them, and them translate the BDD back into formulae.
+    //
+    // The name of the variables are inspired from Couvreur's FM paper.
+    //   "a" variables are promises (written "a" in the paper)
+    //   "next" variables are X's operands (the "r_X" variables from the paper)
+    //   "var" variables are atomic propositions.
+    class translate_dict: public bdd_allocator
+    {
+    public:
+
+      translate_dict()
+	: bdd_allocator(),
+	  a_set(bddtrue),
+	  var_set(bddtrue),
+	  next_set(bddtrue)
+      {
+      }
+
+      ~translate_dict()
+      {
+	fv_map::iterator i;
+	for (i = a_map.begin(); i != a_map.end(); ++i)
+	  ltl::destroy(i->first);
+	for (i = var_map.begin(); i != var_map.end(); ++i)
+	  ltl::destroy(i->first);
+	for (i = next_map.begin(); i != next_map.end(); ++i)
+	  ltl::destroy(i->first);
+      }
+
+      /// Formula-to-BDD-variable maps.
+      typedef std::map<const ltl::formula*, int> fv_map;
+      /// BDD-variable-to-formula maps.
+      typedef std::map<int, const ltl::formula*> vf_map;
+
+      fv_map a_map;	       ///< Maps formulae to "a" BDD variables
+      vf_map a_formula_map;    ///< Maps "a" BDD variables to formulae
+      fv_map var_map;	       ///< Maps atomic propisitions to BDD variables
+      vf_map var_formula_map;  ///< Maps BDD variables to atomic propisitions
+      fv_map next_map;	       ///< Maps "Next" variables to BDD variables
+      vf_map next_formula_map; ///< Maps BDD variables to "Next" variables
+
+      bdd a_set;
+      bdd var_set;
+      bdd next_set;
+
+      int
+      register_proposition(const ltl::formula* f)
+      {
+	int num;
+	// Do not build a variable that already exists.
+	fv_map::iterator sii = var_map.find(f);
+	if (sii != var_map.end())
+	  {
+	    num = sii->second;
+	  }
+	else
+	  {
+	    f = clone(f);
+	    num = allocate_variables(1);
+	    var_map[f] = num;
+	    var_formula_map[num] = f;
+	  }
+	var_set &= bdd_ithvar(num);
+	return num;
+      }
+
+      int
+      register_a_variable(const ltl::formula* f)
+      {
+	int num;
+	// Do not build an accepting variable that already exists.
+	fv_map::iterator sii = a_map.find(f);
+	if (sii != a_map.end())
+	  {
+	    num = sii->second;
+	  }
+	else
+	  {
+	    f = clone(f);
+	    num = allocate_variables(1);
+	    a_map[f] = num;
+	    a_formula_map[num] = f;
+	  }
+	a_set &= bdd_ithvar(num);
+	return num;
+      }
+
+      int
+      register_next_variable(const ltl::formula* f)
+      {
+	int num;
+	// Do not build a Next variable that already exists.
+	fv_map::iterator sii = next_map.find(f);
+	if (sii != next_map.end())
+	  {
+	    num = sii->second;
+	  }
+	else
+	  {
+	    f = clone(f);
+	    num = allocate_variables(1);
+	    next_map[f] = num;
+	    next_formula_map[num] = f;
+	  }
+	next_set &= bdd_ithvar(num);
+	return num;
+      }
+
+      std::ostream&
+      dump(std::ostream& os) const
+      {
+	fv_map::const_iterator fi;
+	os << "Atomic Propositions:" << std::endl;
+	for (fi = var_map.begin(); fi != var_map.end(); ++fi)
+	  {
+	    os << "  " << fi->second << ": ";
+	    to_string(fi->first, os) << std::endl;
+	  }
+	os << "a Variables:" << std::endl;
+	for (fi = a_map.begin(); fi != a_map.end(); ++fi)
+	{
+	  os << "  " << fi->second << ": a[";
+	  to_string(fi->first, os) << "]" << std::endl;
+	}
+	os << "Next Variables:" << std::endl;
+	for (fi = next_map.begin(); fi != next_map.end(); ++fi)
+	{
+	  os << "  " << fi->second << ": Next[";
+	  to_string(fi->first, os) << "]" << std::endl;
+	}
+	return os;
+      }
+
+      ltl::formula*
+      var_to_formula(int var) const
+      {
+	vf_map::const_iterator isi = next_formula_map.find(var);
+	if (isi != next_formula_map.end())
+	  return ltl::clone(isi->second);
+	isi = a_formula_map.find(var);
+	if (isi != a_formula_map.end())
+	  return ltl::clone(isi->second);
+	isi = var_formula_map.find(var);
+	if (isi != var_formula_map.end())
+	  return ltl::clone(isi->second);
+	assert(0);
+      }
+
+      ltl::formula*
+      conj_bdd_to_formula(bdd b)
+      {
+	if (b == bddfalse)
+	  return ltl::constant::false_instance();
+	ltl::multop::vec* v = new ltl::multop::vec;
+	while (b != bddtrue)
+	  {
+	    int var = bdd_var(b);
+	    ltl::formula* res = var_to_formula(var);
+	    bdd high = bdd_high(b);
+	    if (high == bddfalse)
+	      {
+		res = ltl::unop::instance(ltl::unop::Not, res);
+		b = bdd_low(b);
+	      }
+	    else
+	      {
+		b = high;
+	      }
+	    assert(b != bddfalse);
+	    v->push_back(res);
+	  }
+	return ltl::multop::instance(ltl::multop::And, v);
+      }
+
+      void
+      conj_bdd_to_atomic_props(tgba_explicit* a, bdd b,
+			       tgba_explicit::transition* t)
+      {
+	assert(b != bddfalse);
+	while (b != bddtrue)
+	  {
+	    int var = bdd_var(b);
+	    ltl::formula* ap = var_to_formula(var);
+	    bdd high = bdd_high(b);
+	    if (high == bddfalse)
+	      {
+		a->add_neg_condition(t, ap);
+		b = bdd_low(b);
+	      }
+	    else
+	      {
+		a->add_condition(t, ap);
+		b = high;
+	      }
+	    assert(b != bddfalse);
+	  }
+      }
+
+
+      void
+      conj_bdd_to_acc(tgba_explicit* a, bdd b, tgba_explicit::transition* t)
+      {
+	assert(b != bddfalse);
+	while (b != bddtrue)
+	  {
+	    int var = bdd_var(b);
+	    bdd high = bdd_high(b);
+	    if (high == bddfalse)
+	      {
+		// Simply ignore negated accepting variables.
+		b = bdd_low(b);
+	      }
+	    else
+	      {
+		ltl::formula* ac = var_to_formula(var);
+
+		if (! a->has_accepting_condition(ac))
+		  a->declare_accepting_condition(ltl::clone(ac));
+		a->add_accepting_condition(t, ac);
+
+		ltl::atomic_prop::instance_count();
+		b = high;
+	      }
+	    assert(b != bddfalse);
+	  }
+      }
+    };
+
+
+    // The rewrite rules used here are adapted from Jean-Michel
+    // Couvreur's FM paper.
+    class ltl_trad_visitor: public const_visitor
+    {
+    public:
+      ltl_trad_visitor(translate_dict& dict)
+	: dict_(dict)
+      {
+      }
+
+      virtual
+      ~ltl_trad_visitor()
+      {
+      }
+
+      bdd result() const
+      {
+	return res_;
+      }
+
+      void
+      visit(const atomic_prop* node)
+      {
+	res_ = bdd_ithvar(dict_.register_proposition(node));
+      }
+
+      void
+      visit(const constant* node)
+      {
+	switch (node->val())
+	  {
+	  case constant::True:
+	    res_ = bddtrue;
+	    return;
+	  case constant::False:
+	    res_ = bddfalse;
+	    return;
+	  }
+	/* Unreachable code.  */
+	assert(0);
+      }
+
+      void
+      visit(const unop* node)
+      {
+	switch (node->op())
+	  {
+	  case unop::F:
+	    {
+	      // r(Fy) = r(y) + a(y)r(XFy)
+	      bdd y = recurse(node->child());
+	      int a = dict_.register_a_variable(node);
+	      int x = dict_.register_next_variable(node);
+	      res_ = y | (bdd_ithvar(a) & bdd_ithvar(x));
+	      return;
+	    }
+	  case unop::G:
+	    {
+	      // r(Gy) = r(y)r(XGy)
+	      bdd y = recurse(node->child());
+	      int x = dict_.register_next_variable(node);
+	      res_ = y & bdd_ithvar(x);
+	      return;
+	    }
+	  case unop::Not:
+	    {
+	      res_ = bdd_not(recurse(node->child()));
+	      return;
+	    }
+	  case unop::X:
+	    {
+	      int x = dict_.register_next_variable(node->child());
+	      res_ = bdd_ithvar(x);
+	      return;
+	    }
+	  }
+	/* Unreachable code.  */
+	assert(0);
+      }
+
+      void
+      visit(const binop* node)
+      {
+	bdd f1 = recurse(node->first());
+	bdd f2 = recurse(node->second());
+
+	switch (node->op())
+	  {
+	  case binop::Xor:
+	    res_ = bdd_apply(f1, f2, bddop_xor);
+	    return;
+	  case binop::Implies:
+	    res_ = bdd_apply(f1, f2, bddop_imp);
+	    return;
+	  case binop::Equiv:
+	    res_ = bdd_apply(f1, f2, bddop_biimp);
+	    return;
+	  case binop::U:
+	    {
+	      // r(f1 U f2) = r(f2) + a(f2)r(f1)r(X(f1 U f2))
+	      int a = dict_.register_a_variable(node->second());
+	      int x = dict_.register_next_variable(node);
+	      res_ = f2 | (bdd_ithvar(a) & f1 & bdd_ithvar(x));
+	      return;
+	    }
+	  case binop::R:
+	    {
+	      // r(f1 R f2) = r(f1)r(f2) + r(f2)r(X(f1 U f2))
+	      int x = dict_.register_next_variable(node);
+	      res_ = (f1 & f2) | (f2 & bdd_ithvar(x));
+	      return;
+	    }
+	  }
+	/* Unreachable code.  */
+	assert(0);
+      }
+
+      void
+      visit(const multop* node)
+      {
+	int op = -1;
+	switch (node->op())
+	  {
+	  case multop::And:
+	    op = bddop_and;
+	    res_ = bddtrue;
+	    break;
+	  case multop::Or:
+	    op = bddop_or;
+	    res_ = bddfalse;
+	    break;
+	  }
+	assert(op != -1);
+	unsigned s = node->size();
+	for (unsigned n = 0; n < s; ++n)
+	  {
+	    res_ = bdd_apply(res_, recurse(node->nth(n)), op);
+	  }
+      }
+
+      bdd
+      recurse(const formula* f)
+      {
+	ltl_trad_visitor v(dict_);
+	f->accept(v);
+	return v.result();
+      }
+
+
+    private:
+      translate_dict& dict_;
+      bdd res_;
+    };
+
+  }
+
+  tgba_explicit*
+  ltl_to_tgba_fm(const ltl::formula* f, bdd_dict* dict)
+  {
+    // Normalize the formula.  We want all the negations on
+    // the atomic propositions.  We also suppress logic
+    // abbreviations such as <=>, =>, or XOR, since they
+    // would involve negations at the BDD level.
+    ltl::formula* f1 = ltl::unabbreviate_logic(f);
+    ltl::formula* f2 = ltl::negative_normal_form(f1);
+    ltl::destroy(f1);
+
+    std::set<ltl::formula*> formulae_seen;
+    std::set<ltl::formula*> formulae_to_translate;
+
+    formulae_seen.insert(f2);
+    formulae_to_translate.insert(f2);
+
+    tgba_explicit* a = new tgba_explicit(dict);
+
+    a->set_init_state(to_string(f2));
+
+    while (!formulae_to_translate.empty())
+      {
+	// Pick one formula.
+	ltl::formula* f = *formulae_to_translate.begin();
+	formulae_to_translate.erase(formulae_to_translate.begin());
+
+	// Translate it into a BDD to simplify it.
+	translate_dict d;
+	ltl_trad_visitor v(d);
+	f->accept(v);
+	bdd res = v.result();
+
+	std::string now = to_string(f);
+
+	bdd all = res;
+	bdd outside = !all;
+	while (all != bddfalse)
+	  {
+
+	    bdd cube = bdd_satone(all);
+	    cube = bdd_simplify(cube, cube | outside);
+	    all -= cube;
+
+	    ltl::formula* dest =
+	      d.conj_bdd_to_formula(bdd_existcomp(cube, d.next_set));
+
+	    std::string next = to_string(dest);
+
+	    tgba_explicit::transition* t = a->create_transition(now, next);
+
+	    d.conj_bdd_to_atomic_props(a, bdd_existcomp(cube, d.var_set), t);
+	    d.conj_bdd_to_acc(a, bdd_existcomp(cube, d.a_set), t);
+
+
+	    if (formulae_seen.find(dest) == formulae_seen.end())
+	      {
+		formulae_seen.insert(dest);
+		formulae_to_translate.insert(dest);
+	      }
+	    else
+	      {
+		ltl::destroy(dest);
+	      }
+	  }
+      }
+
+    // Free all formulae.
+    for (std::set<ltl::formula*>::iterator i = formulae_seen.begin();
+	 i != formulae_seen.end(); ++i)
+      ltl::destroy(*i);
+
+    // Turn all promises into real accepting conditions.
+    a->complement_all_accepting_conditions();
+    return a;
+  }
+
+}
diff --git a/src/tgbaalgos/ltl2tgba_fm.hh b/src/tgbaalgos/ltl2tgba_fm.hh
new file mode 100644
index 000000000..3f88d9c60
--- /dev/null
+++ b/src/tgbaalgos/ltl2tgba_fm.hh
@@ -0,0 +1,32 @@
+#ifndef SPOT_TGBA_LTL2TGBA_FME_HH
+# define SPOT_TGBA_LTL2TGBA_FME_HH
+
+#include "ltlast/formula.hh"
+#include "tgba/tgbaexplicit.hh"
+
+namespace spot
+{
+  /// \brief Build a spot::tgba_explicit* from an LTL formula.
+  ///
+  /// This is based on the following paper.
+  /// \verbatim
+  /// @InProceedings{couvreur.99.fm,
+  ///   author	  = {Jean-Michel Couvreur},
+  ///   title     = {On-the-fly Verification of Temporal Logic},
+  ///   pages     = {253--271},
+  ///   editor	  = {Jeannette M. Wing and Jim Woodcock and Jim Davies},
+  ///   booktitle = {Proceedings of the World Congress on Formal Methods in the
+  /// 		     Development of Computing Systems (FM'99)},
+  ///   publisher = {Springer-Verlag},
+  ///   series	  = {Lecture Notes in Computer Science},
+  ///   volume	  = {1708},
+  ///   year      = {1999},
+  ///   address	  = {Toulouse, France},
+  ///   month	  = {September},
+  ///   isbn      = {3-540-66587-0}
+  /// }
+  /// \endverbatim
+  tgba_explicit* ltl_to_tgba_fm(const ltl::formula* f, bdd_dict* dict);
+}
+
+#endif // SPOT_TGBA_LTL2TGBA_HH
diff --git a/src/tgbatest/Makefile.am b/src/tgbatest/Makefile.am
index 6f60dfb62..11e68ba57 100644
--- a/src/tgbatest/Makefile.am
+++ b/src/tgbatest/Makefile.am
@@ -12,8 +12,6 @@ check_PROGRAMS = \
   ltlprod \
   mixprod \
   readsave \
-  spotlbtt \
-  tbalbtt \
   tgbaread \
   tripprod
 
@@ -27,11 +25,8 @@ ltlmagic_SOURCES = ltlmagic.cc
 ltlprod_SOURCES  = ltlprod.cc
 mixprod_SOURCES  = mixprod.cc
 readsave_SOURCES = readsave.cc
-tbalbtt_SOURCES  = spotlbtt.cc
-tbalbtt_CXXFLAGS = -DTBA
 tgbaread_SOURCES = tgbaread.cc
 tripprod_SOURCES = tripprod.cc
-spotlbtt_SOURCES = spotlbtt.cc
 
 # Keep this sorted by STRENGTH.  Test basic things first,
 # because such failures will be easier to diagnose and fix.
diff --git a/src/tgbatest/ltl2tgba.cc b/src/tgbatest/ltl2tgba.cc
index 9b681af77..3167499b5 100644
--- a/src/tgbatest/ltl2tgba.cc
+++ b/src/tgbatest/ltl2tgba.cc
@@ -1,9 +1,12 @@
 #include <iostream>
 #include <cassert>
+#include <fstream>
+#include <string>
 #include "ltlvisit/destroy.hh"
 #include "ltlast/allnodes.hh"
 #include "ltlparse/public.hh"
 #include "tgbaalgos/ltl2tgba.hh"
+#include "tgbaalgos/ltl2tgba_fm.hh"
 #include "tgba/bddprint.hh"
 #include "tgbaalgos/dotty.hh"
 #include "tgbaalgos/lbtt.hh"
@@ -13,6 +16,7 @@ void
 syntax(char* prog)
 {
   std::cerr << "Usage: "<< prog << " [OPTIONS...] formula" << std::endl
+            << "       "<< prog << " -F [OPTIONS...] file" << std::endl
 	    << std::endl
 	    << "Options:" << std::endl
 	    << "  -a   display the accepting_conditions BDD, not the reachability graph"
@@ -20,6 +24,9 @@ syntax(char* prog)
 	    << "  -A   same as -a, but as a set" << std::endl
 	    << "  -d   turn on traces during parsing" << std::endl
 	    << "  -D   degeneralize the automaton" << std::endl
+            << "  -f   use Couvreur's FM algorithm for translation"
+	    << std::endl
+            << "  -F   read the formula from the file" << std::endl
 	    << "  -r   display the relation BDD, not the reachability graph"
 	    << std::endl
 	    << "  -R   same as -r, but as a set" << std::endl
@@ -36,6 +43,8 @@ main(int argc, char** argv)
 
   bool debug_opt = false;
   bool degeneralize_opt = false;
+  bool fm_opt = false;
+  bool file_opt = false;
   int output = 0;
   int formula_index = 0;
 
@@ -62,6 +71,14 @@ main(int argc, char** argv)
 	{
 	  degeneralize_opt = true;
 	}
+      else if (!strcmp(argv[formula_index], "-f"))
+	{
+	  fm_opt = true;
+	}
+      else if (!strcmp(argv[formula_index], "-F"))
+	{
+	  file_opt = true;
+	}
       else if (!strcmp(argv[formula_index], "-r"))
 	{
 	  output = 1;
@@ -84,19 +101,46 @@ main(int argc, char** argv)
 	}
     }
 
+  std::string input;
+
+  if (file_opt)
+    {
+      std::ifstream fin(argv[formula_index]);
+      if (! fin)
+	{
+	  std::cerr << "Cannot open " << argv[formula_index] << std::endl;
+	  exit(2);
+	}
+
+      if (! std::getline(fin, input, '\0'))
+	{
+	  std::cerr << "Cannot read " << argv[formula_index] << std::endl;
+	  exit(2);
+	}
+    }
+  else
+    {
+      input = argv[formula_index];
+    }
+
   spot::ltl::environment& env(spot::ltl::default_environment::instance());
   spot::ltl::parse_error_list pel;
-  spot::ltl::formula* f = spot::ltl::parse(argv[formula_index],
-					   pel, env, debug_opt);
+  spot::ltl::formula* f = spot::ltl::parse(input, pel, env, debug_opt);
 
-  exit_code =
-    spot::ltl::format_parse_errors(std::cerr, argv[formula_index], pel);
+  exit_code = spot::ltl::format_parse_errors(std::cerr, input, pel);
 
   spot::bdd_dict* dict = new spot::bdd_dict();
   if (f)
     {
-      spot::tgba_bdd_concrete* concrete = spot::ltl_to_tgba(f, dict);
-      spot::tgba* a = concrete;
+      spot::tgba_bdd_concrete* concrete = 0;
+      spot::tgba* to_free = 0;
+      spot::tgba* a = 0;
+
+      if (fm_opt)
+	to_free = a = spot::ltl_to_tgba_fm(f, dict);
+      else
+	to_free = a = concrete = spot::ltl_to_tgba(f, dict);
+
       spot::ltl::destroy(f);
 
       spot::tgba* degeneralized = 0;
@@ -109,20 +153,26 @@ main(int argc, char** argv)
 	  spot::dotty_reachable(std::cout, a);
 	  break;
 	case 1:
-	  spot::bdd_print_dot(std::cout, concrete->get_dict(),
-			      concrete->get_core_data().relation);
+	  if (concrete)
+	    spot::bdd_print_dot(std::cout, concrete->get_dict(),
+				concrete->get_core_data().relation);
 	  break;
 	case 2:
-	  spot::bdd_print_dot(std::cout, concrete->get_dict(),
-			      concrete->get_core_data().accepting_conditions);
+	  if (concrete)
+	    spot::bdd_print_dot(std::cout, concrete->get_dict(),
+				concrete->
+				get_core_data().accepting_conditions);
 	  break;
 	case 3:
-	  spot::bdd_print_set(std::cout, concrete->get_dict(),
-			      concrete->get_core_data().relation);
+	  if (concrete)
+	    spot::bdd_print_set(std::cout, concrete->get_dict(),
+				concrete->get_core_data().relation);
 	  break;
 	case 4:
-	  spot::bdd_print_set(std::cout, concrete->get_dict(),
-			      concrete->get_core_data().accepting_conditions);
+	  if (concrete)
+	    spot::bdd_print_set(std::cout, concrete->get_dict(),
+				concrete->
+				get_core_data().accepting_conditions);
 	  break;
 	case 5:
 	  a->get_dict()->dump(std::cout);
@@ -137,7 +187,7 @@ main(int argc, char** argv)
       if (degeneralize_opt)
 	delete degeneralized;
 
-      delete concrete;
+      delete to_free;
     }
   else
     {
diff --git a/src/tgbatest/spotlbtt.cc b/src/tgbatest/spotlbtt.cc
deleted file mode 100644
index 519f5977b..000000000
--- a/src/tgbatest/spotlbtt.cc
+++ /dev/null
@@ -1,74 +0,0 @@
-#include <iostream>
-#include <fstream>
-#include <cassert>
-#include <string>
-#include "ltlvisit/destroy.hh"
-#include "ltlast/allnodes.hh"
-#include "ltlparse/public.hh"
-#include "tgbaalgos/ltl2tgba.hh"
-#include "tgbaalgos/lbtt.hh"
-#include "tgba/tgbatba.hh"
-
-void
-syntax(char* prog)
-{
-  std::cerr << "Usage: "<< prog << " file" << std::endl;
-  exit(2);
-}
-
-int
-main(int argc, char** argv)
-{
-  int exit_code = 0;
-
-  if (argc !=  2)
-    syntax(argv[0]);
-
-  std::ifstream fin(argv[1]);
-  if (! fin)
-    {
-      std::cerr << "Cannot open " << argv[1] << std::endl;
-      exit(2);
-    }
-
-  std::string input;
-  if (! std::getline(fin, input, '\0'))
-    {
-      std::cerr << "Cannot read " << argv[1] << std::endl;
-      exit(2);
-    }
-
-  spot::bdd_dict* dict = new spot::bdd_dict();
-
-  spot::ltl::environment& env(spot::ltl::default_environment::instance());
-  spot::ltl::parse_error_list pel;
-  spot::ltl::formula* f = spot::ltl::parse(input, pel, env);
-
-  exit_code = spot::ltl::format_parse_errors(std::cerr, input, pel);
-
-  if (f)
-    {
-      spot::tgba* a;
-      spot::tgba* c = a = spot::ltl_to_tgba(f, dict);
-      spot::ltl::destroy(f);
-#ifdef TBA
-      spot::tgba* d = a = new spot::tgba_tba_proxy(a);
-#endif
-      spot::lbtt_reachable(std::cout, a);
-#ifdef TBA
-      delete d;
-#endif
-      delete c;
-    }
-  else
-    {
-      exit_code = 1;
-    }
-
-  assert(spot::ltl::atomic_prop::instance_count() == 0);
-  assert(spot::ltl::unop::instance_count() == 0);
-  assert(spot::ltl::binop::instance_count() == 0);
-  assert(spot::ltl::multop::instance_count() == 0);
-  delete dict;
-  return exit_code;
-}
diff --git a/src/tgbatest/spotlbtt.test b/src/tgbatest/spotlbtt.test
index 76b133c6b..e9059f2db 100755
--- a/src/tgbatest/spotlbtt.test
+++ b/src/tgbatest/spotlbtt.test
@@ -7,15 +7,29 @@ set -e
 cat > config <<EOF
 Algorithm
 {
-   Name = "Spot"
-   Path = "${LBTT_TRANSLATE} --spot ./spotlbtt"
+   Name = "Spot (Couvreur -- LaCIM)"
+   Path = "${LBTT_TRANSLATE} --spot './ltl2tgba -F -t'"
    Enabled = yes
 }
 
 Algorithm
 {
-   Name = "Spot TBA"
-   Path = "${LBTT_TRANSLATE} --spot ./tbalbtt"
+   Name = "Spot (Couvreur -- LACIM), degeneralized"
+   Path = "${LBTT_TRANSLATE} --spot './ltl2tgba -F -t -D'"
+   Enabled = yes
+}
+
+Algorithm
+{
+   Name = "Spot (Couvreur -- FM)"
+   Path = "${LBTT_TRANSLATE} --spot './ltl2tgba -F -f -t'"
+   Enabled = yes
+}
+
+Algorithm
+{
+   Name = "Spot (Couvreur -- FM), degeneralized"
+   Path = "${LBTT_TRANSLATE} --spot './ltl2tgba -F -f -t -D'"
    Enabled = yes
 }
 
diff --git a/wrap/python/cgi/ltl2tgba.in b/wrap/python/cgi/ltl2tgba.in
index b3d5baf33..b2caaf75a 100644
--- a/wrap/python/cgi/ltl2tgba.in
+++ b/wrap/python/cgi/ltl2tgba.in
@@ -68,9 +68,29 @@ options = [
     ('show_lbtt',           'convert automaton for LBTT',                  0),
     ]
 
+default_translator = 'trans_lacim';
+translators = [
+    ('trans_lacim',     'Convreur/LaCIM'),
+    ('trans_fm',        'Convreur/FM'),
+    ]
+
 print """<FORM action="%s" method="post"><P>
 Formula to translate: <INPUT type="text"  name="formula" value="%s"><BR>
-Options:<TABLE><TR><TD>""" % (myself, formula)
+Translator:<TABLE><TR><TD>""" % (myself, formula)
+
+
+trans = form.getfirst("trans", default_translator)
+for opt, desc, in translators:
+    if trans == opt:
+	str = "checked"
+    else:
+	str = ""
+    globals()[opt] = str
+    print '<INPUT type="radio" name="trans" value="%s" %s>%s<br>' % (opt, str,
+                                                                     desc)
+
+print """</TD></TR></TABLE>
+Options:<TABLE><TR><TD>"""
 
 for opt, desc, arg, in options:
     if formula:
@@ -140,7 +160,10 @@ dict = spot.bdd_dict()
 print '<p>Building automaton...',
 sys.stdout.flush()
 
-concrete = spot.ltl_to_tgba(f, dict)
+if trans_lacim:
+    automaton = spot.ltl_to_tgba(f, dict)
+elif trans_fm:
+    automaton = spot.ltl_to_tgba_fm(f, dict)
 
 print 'done.</p>'
 sys.stdout.flush()
@@ -148,14 +171,14 @@ sys.stdout.flush()
 if show_automaton_dot:
     print '<pre>'; sys.stdout.flush()
     s = spot.ostringstream()
-    spot.dotty_reachable(s, concrete)
+    spot.dotty_reachable(s, automaton)
     print cgi.escape(s.str())
     del s
     print '</pre>'; sys.stdout.flush()
 
 if show_automaton_gif:
     outfile = spot.ofstream(imgprefix + '-a.dot')
-    spot.dotty_reachable(outfile, concrete)
+    spot.dotty_reachable(outfile, automaton)
     del outfile
     os.spawnlp(os.P_WAIT, 'dot', 'dot', '-Tgif', '-Gsize=14,14', '-o',
 	       imgprefix + '-a.gif', imgprefix + '-a.dot')
@@ -166,7 +189,7 @@ if show_automaton_gif:
 
 if show_degen_dot or show_degen_gif:
     print '<H3>Degeneralized automaton</H3>'
-    degen = spot.tgba_tba_proxy(concrete)
+    degen = spot.tgba_tba_proxy(automaton)
     if show_degen_dot:
 	print '<pre>'; sys.stdout.flush()
 	s = spot.ostringstream()
@@ -190,21 +213,22 @@ if show_dictionnay:
     print '<H3>BDD dictionary</H3>'
     print '<pre>'
     sys.stdout.flush()
-    concrete.get_dict().dump(spot.get_cout())
+    automaton.get_dict().dump(spot.get_cout())
     print '</pre>'
 
-if show_relation_dot or show_relation_set or show_relation_gif:
+if (type(automaton) == spot.tgba_bdd_concrete
+    and (show_relation_dot or show_relation_set or show_relation_gif)):
     print '<H3>Transition relation</H3>'
     if show_relation_dot:
-	escaped_print_dot(concrete.get_dict(),
-			  concrete.get_core_data().relation)
+	escaped_print_dot(automaton.get_dict(),
+			  automaton.get_core_data().relation)
     if show_relation_set:
-	escaped_print_set(concrete.get_dict(),
-			  concrete.get_core_data().relation)
+	escaped_print_set(automaton.get_dict(),
+			  automaton.get_core_data().relation)
     if show_relation_gif:
 	outfile = spot.ofstream(imgprefix + '-b.dot')
-	spot.bdd_print_dot(outfile, concrete.get_dict(),
-			   concrete.get_core_data().relation)
+	spot.bdd_print_dot(outfile, automaton.get_dict(),
+			   automaton.get_core_data().relation)
 	del outfile
 	os.spawnlp(os.P_WAIT, 'dot', 'dot', '-Tgif', '-Gsize=14,14', '-o',
 		   imgprefix + '-b.gif', imgprefix + '-b.dot')
@@ -212,18 +236,19 @@ if show_relation_dot or show_relation_set or show_relation_gif:
                    imgprefix + '-b.gif', imgprefix + '-b.png')
 	print '<img src="' + imgprefix + '-b.png">'
 
-if show_acceptance_dot or show_acceptance_set or show_acceptance_gif:
+if (type(automaton) == spot.tgba_bdd_concrete
+    and (show_acceptance_dot or show_acceptance_set or show_acceptance_gif)):
     print '<H3>Acceptance relation</H3>'
     if show_acceptance_dot:
-	escaped_print_dot(concrete.get_dict(),
-			  concrete.get_core_data().accepting_conditions)
+	escaped_print_dot(automaton.get_dict(),
+			  automaton.get_core_data().accepting_conditions)
     if show_acceptance_set:
-	escaped_print_set(concrete.get_dict(),
-			  concrete.get_core_data().accepting_conditions)
+	escaped_print_set(automaton.get_dict(),
+			  automaton.get_core_data().accepting_conditions)
     if show_acceptance_gif:
 	outfile = spot.ofstream(imgprefix + '-c.dot')
-	spot.bdd_print_dot(outfile, concrete.get_dict(),
-			   concrete.get_core_data().accepting_conditions)
+	spot.bdd_print_dot(outfile, automaton.get_dict(),
+			   automaton.get_core_data().accepting_conditions)
 	del outfile
 	os.spawnlp(os.P_WAIT, 'dot', 'dot', '-Tgif', '-Gsize=14,14', '-o',
 		   imgprefix + '-c.gif', imgprefix + '-c.dot')
@@ -237,7 +262,7 @@ if show_lbtt:
 	print '<H4>Conversion of the generalized automaton</H4>'
     print '<pre>'
     sys.stdout.flush()
-    spot.lbtt_reachable(spot.get_cout(), concrete)
+    spot.lbtt_reachable(spot.get_cout(), automaton)
     print '</pre>'
     if degen:
 	print '<H4>Conversion of the degeneralized automaton</H4>'
@@ -248,9 +273,10 @@ if show_lbtt:
 
 sys.stdout.flush()
 
-# Make sure degen is cleared before concrete.
+spot.destroy(f)
+# Make sure degen is cleared before automaton.
 del degen
-del concrete
+del automaton
 
 print '<hr>'
 print 'ltl2tgba.py @PACKAGE_VERSION@; Spot', spot.version()
diff --git a/wrap/python/spot.i b/wrap/python/spot.i
index 33c128199..0f4a8405e 100644
--- a/wrap/python/spot.i
+++ b/wrap/python/spot.i
@@ -49,6 +49,7 @@
 #include "tgba/tgbatba.hh"
 
 #include "tgbaalgos/ltl2tgba.hh"
+#include "tgbaalgos/ltl2tgba_fm.hh"
 #include "tgbaalgos/dotty.hh"
 #include "tgbaalgos/lbtt.hh"
 #include "tgbaalgos/magic.hh"
@@ -84,6 +85,7 @@ using namespace spot;
 %include "ltlvisit/tunabbrev.hh"
 
 %feature("new") spot::ltl_to_tgba;
+%feature("new") spot::ltl_to_tgba_fm;
 %feature("new") spot::tgba::get_init_state;
 %feature("new") spot::tgba::succ_iter;
 %feature("new") spot::tgba_succ_iterator::current_state;
@@ -104,6 +106,7 @@ using namespace spot;
 %include "tgba/tgbatba.hh"
 
 %include "tgbaalgos/ltl2tgba.hh"
+%include "tgbaalgos/ltl2tgba_fm.hh"
 %include "tgbaalgos/dotty.hh"
 %include "tgbaalgos/lbtt.hh"
 %include "tgbaalgos/magic.hh"
diff --git a/wrap/python/tests/ltl2tgba.py b/wrap/python/tests/ltl2tgba.py
index ca84c7184..12c77a166 100755
--- a/wrap/python/tests/ltl2tgba.py
+++ b/wrap/python/tests/ltl2tgba.py
@@ -14,6 +14,7 @@ Options:
   -A   same as -a, but as a set
   -d   turn on traces during parsing
   -D   degeneralize the automaton
+  -f   use Couvreur's FM algorithm for translation
   -r   display the relation BDD, not the reachability graph
   -R   same as -r, but as a set
   -t   display reachable states in LBTT's format
@@ -23,7 +24,7 @@ Options:
 
 prog = sys.argv[0]
 try:
-    opts, args = getopt.getopt(sys.argv[1:], 'aAdDrRtv')
+    opts, args = getopt.getopt(sys.argv[1:], 'aAdDfrRtv')
 except getopt.GetoptError:
     usage(prog)
 
@@ -31,6 +32,7 @@ exit_code = 0
 debug_opt = 0
 degeneralize_opt = None
 output = 0
+fm_opt = 0
 
 for o, a in opts:
     if o == '-a':
@@ -41,6 +43,8 @@ for o, a in opts:
         debug_opt = 1
     elif o == '-D':
         degeneralize_opt = 1
+    elif o == '-f':
+        fm_opt = 1
     elif o == '-r':
         output = 1
     elif o == '-R':
@@ -65,14 +69,17 @@ p = spot.empty_parse_error_list()
 f = spot.parse(args[0], p, e, debug_opt)
 if spot.format_parse_errors(cerr, args[0], p):
     exit_code = 1
-    
+
 dict = spot.bdd_dict()
 
 if f:
-    concrete = spot.ltl_to_tgba(f, dict)
+    if fm_opt:
+        a = spot.ltl_to_tgba_fm(f, dict)
+        concrete = 0
+    else:
+        a = concrete = spot.ltl_to_tgba(f, dict)
     spot.destroy(f)
     del f
-    a = concrete
 
     degeneralized = None
     if degeneralize_opt:
@@ -81,18 +88,22 @@ if f:
     if output == 0:
         spot.dotty_reachable(cout, a)
     elif output == 1:
-        spot.bdd_print_dot(cout, concrete.get_dict(),
-                           concrete.get_core_data().relation)
+        if concrete:
+            spot.bdd_print_dot(cout, concrete.get_dict(),
+                               concrete.get_core_data().relation)
     elif output == 2:
-        spot.bdd_print_dot(cout, concrete.get_dict(),
-                           concrete.get_core_data().accepting_conditions)
+        if concrete:
+            spot.bdd_print_dot(cout, concrete.get_dict(),
+                               concrete.get_core_data().accepting_conditions)
     elif output == 3:
-        spot.bdd_print_set(cout, concrete.get_dict(),
-                           concrete.get_core_data().relation)
+        if concrete:
+            spot.bdd_print_set(cout, concrete.get_dict(),
+                               concrete.get_core_data().relation)
         print
     elif output == 4:
-        spot.bdd_print_set(cout, concrete.get_dict(),
-                           concrete.get_core_data().accepting_conditions)
+        if concrete:
+            spot.bdd_print_set(cout, concrete.get_dict(),
+                               concrete.get_core_data().accepting_conditions)
         print
     elif output == 5:
         a.get_dict().dump(cout)
@@ -116,4 +127,3 @@ assert spot.atomic_prop.instance_count() == 0
 assert spot.unop.instance_count() == 0
 assert spot.binop.instance_count() == 0
 assert spot.multop.instance_count() == 0
-
diff --git a/wrap/python/tests/ltl2tgba.test b/wrap/python/tests/ltl2tgba.test
index 3400f06cf..8fcc33c9b 100755
--- a/wrap/python/tests/ltl2tgba.test
+++ b/wrap/python/tests/ltl2tgba.test
@@ -14,3 +14,13 @@ set -e
 ./run ltl2tgba.py 'Fa & Xb & GFc & Gd'
 ./run ltl2tgba.py 'Fa & Xa & GFc & Gc'
 ./run ltl2tgba.py 'Fc & X(a | Xb) & GF(a | Xb) & Gc'
+
+./run ltl2tgba.py -f a
+./run ltl2tgba.py -f 'a U b'
+./run ltl2tgba.py -f 'X a'
+./run ltl2tgba.py -f 'a & b & c'
+./run ltl2tgba.py -f 'a | b | (c U (d & (g U (h ^ i))))'
+./run ltl2tgba.py -f 'Xa & (b U !a) & (b U !a)'
+./run ltl2tgba.py -f 'Fa & Xb & GFc & Gd'
+./run ltl2tgba.py -f 'Fa & Xa & GFc & Gc'
+./run ltl2tgba.py -f 'Fc & X(a | Xb) & GF(a | Xb) & Gc'