diff -r e68f0ef37e77 -r 73e29215aaa4 lemon/vf2pp.h
--- a/lemon/vf2pp.h	Sat Oct 07 17:03:30 2017 +0200
+++ b/lemon/vf2pp.h	Wed Oct 17 22:55:02 2018 +0200
@@ -32,10 +32,10 @@
 
 namespace lemon {
 
-  ///%VF2 Plus Plus algorithm class.
+  ///%VF2 Plus Plus algorithm class \cite VF2PP.
 
   ///\ingroup graph_isomorphism This class provides an efficient
-  ///implementation of the %VF2 Plus Plus algorithm
+  ///implementation of the %VF2 Plus Plus algorithm \cite VF2PP
   ///for variants of the (Sub)graph Isomorphism problem.
   ///
   ///There is also a \ref vf2pp() "function-type interface" called