diff -r dbe3fc9c875d -r 32155c88f59b lemon/lgf_writer.h
--- a/lemon/lgf_writer.h	Tue Jul 29 14:41:55 2008 +0200
+++ b/lemon/lgf_writer.h	Tue Jul 29 15:06:37 2008 +0200
@@ -18,7 +18,7 @@
 
 ///\ingroup lemon_io
 ///\file
-///\brief \ref lgf-format "Lemon Graph Format" writer.
+///\brief \ref lgf-format "LEMON Graph Format" writer.
 
 
 #ifndef LEMON_LGF_WRITER_H
@@ -934,7 +934,7 @@
     std::ostream* _os;
     bool local_os;
 
-    Graph& _graph;
+    const Graph& _graph;
 
     std::string _nodes_caption;
     std::string _edges_caption;