diff -r 95e9c4556221 -r 8fda6b452f28 CookBook/Recipes/ExternalSolver.thy
--- a/CookBook/Recipes/ExternalSolver.thy	Mon Jan 26 12:29:43 2009 +0000
+++ b/CookBook/Recipes/ExternalSolver.thy	Mon Jan 26 16:09:02 2009 +0000
@@ -2,7 +2,7 @@
 imports "../Base"
 begin
 
-section {* Using an External Solver *} 
+section {* Using an External Solver\label{rec:external} *} 
 
 text {*
   {\bf Problem:}