diff --git a/doc/spot.bib b/doc/spot.bib
index ddfd746d8..173567c15 100644
--- a/doc/spot.bib
+++ b/doc/spot.bib
@@ -85,7 +85,7 @@
 		  Structures - 14th International Conference, FOSSACS 2011},
   year		= {2011},
   pages		= {184--198},
-  url		= {\url{www.cs.huji.ac.il/~ornak/publications/fossacs11b.pdf}}
+  url		= {http://www.cs.huji.ac.il/~ornak/publications/fossacs11b.pdf}
 }
 
 @Article{	  bruggeman.96.tcs,
@@ -155,7 +155,7 @@
   volume	= 27,
   year		= 2008,
   date		= {2009-03-20},
-  note		= {\url{https://es.fbk.eu/people/tonetta/tests/tcad07/}}
+  url		= {https://es.fbk.eu/people/tonetta/tests/tcad07/}
 }
 
 @Article{	  courcoubetis.92.fmsd,
@@ -569,7 +569,7 @@
   publisher	= {Accellera},
   year		= {2004},
   month		= jun,
-  note		= {\url{http://www.eda.org/vfv/}}
+  url		= {http://www.eda.org/vfv/}
 }
 
 @InProceedings{	  renault.13.tacas,