--- a/cookbook.bib	Fri Sep 05 09:47:51 2008 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,6 +0,0 @@
-
-@manual{isa-imp,
-  author	= {Makarius Wenzel},
-  title		= {The {Isabelle/Isar} Implementation},
-  institution	= {Technische Universit\"at M\"unchen},
-  note          = {\url{http://isabelle.in.tum.de/doc/implementation.pdf}}}