gfguarante: update citation

* spot/twaalgos/gfguarantee.hh: Properly cite the LICS'18 paper.
* doc/spot.bib: Add the entry.

doc/spot.bib

@@ -1,4 +1,3 @@
-
 @InProceedings{	  babiak.12.tacas,
   author	= {Tom{\'a}{\v{s}} Babiak and Mojm{\'i}r
 		  K{\v{r}}et{\'i}nsk{\'y} and Vojt{\v{e}}ch {\v{R}}eh{\'a}k
@@ -457,6 +456,20 @@
   doi		= {10.1007/978-3-642-01702-5_17}
 }
 
+@InProceedings{	  esparza.18.lics,
+  author	= {Javier Esparza and Jan K\v{r}et{\'{\i}}nsk{\'{y}} and
+		  Salomon Sickert},
+  title		= {One Theorem to Rule Them All: {A} Unified Translation of
+		  {LTL} into $\omega$-Automata},
+  booktitle	= {Proceedings of the 33rd Annual {ACM/IEEE} Symposium on
+		  Logic in Computer Science (LICS'18)},
+  pages		= {384--393},
+  year		= {2018},
+  editor	= {Anuj Dawar and Erich Gr{\"{a}}del},
+  publisher	= {ACM},
+  doi		= {10.1145/3209108.3209161}
+}
+
 @InProceedings{	  etessami.00.concur,
   author	= {Kousha Etessami and Gerard J. Holzmann},
   title		= {Optimizing {B\"u}chi Automata},

spot/twaalgos/gfguarantee.hh

@@ -1,6 +1,6 @@
 // -*- coding: utf-8 -*-
-// Copyright (C) 2018, 2022 Laboratoire de Recherche et Développement
+// Copyright (C) 2018, 2022, 2023 Laboratoire de Recherche et
-// de l'Epita (LRDE).
+// Développement de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -30,17 +30,17 @@ namespace spot
   /// \brief Given a terminal automaton \a f_terminal recognizing
   /// some formula F(φ), modify it to recognize GF(φ).
   ///
-  /// If \a state_based is set, the automaton all terminal states are
+  /// If \a state_based is set, the automaton's terminal states are
-  /// replaced by a unique accepting state that has the same outgoing
+  /// all replaced by a unique accepting state that has the same
-  /// transitions as the initial state, and the initial state is
+  /// outgoing transitions as the initial state, and the initial state
-  /// actually relocated to that accepting state.  The latter point is
+  /// is actually relocated to that accepting state.  The latter point
-  /// not necessary, but it favors shorter accepting cycles.
+  /// is not necessary, but it favors shorter accepting cycles.
   ///
   /// If \a state_based is not set, all transition going to terminal
   /// states are made accepting and redirected to the initial state.
   ///
   /// This construction is inspired by a similar construction in the
-  /// LICS'18 paper by J. Esparza, J. Křetínský, and S. Sickert.
+  /// LICS'18 paper by Esparza et al. \cite esparza.18.lics
   SPOT_API twa_graph_ptr
   g_f_terminal_inplace(twa_graph_ptr f_terminal, bool state_based = false);
 
@@ -57,12 +57,12 @@ namespace spot
   /// Return nullptr if the input formula is not of the supported
   /// form.
   ///
-  /// This construction generalizes a construction in the LICS'18
+  /// This construction generalizes a construction in a LICS'18
-  /// paper of J. Esparza, J. Křetínský, and S. Sickert.  This version
+  /// paper by Esparza et al.  \cite esparza.18.lics
-  /// will work if Φ represent a safety property, even if it is not a
+  /// This version will work if Φ represents a safety property, even if
-  /// syntactic safety.  When building deterministic transition-based
+  /// it is not a syntactic safety.  When building deterministic
-  /// automata, it will also try to remove useless trivial components
+  /// transition-based automata, it will also try to remove useless
-  /// at the beginning of wdba(A_Φ).
+  /// trivial components at the beginning of wdba(A_Φ).
   SPOT_API twa_graph_ptr
   gf_guarantee_to_ba_maybe(formula gf, const bdd_dict_ptr& dict,
                            bool deterministic = true, bool state_based = false);