Graham Steel Alan Bundy Monika Maidl Attacking a Protocol for Group Key Agreement by Refuting Incorrect Inductive Conjectures. 137-151 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3097&spage=137 2004 conf/cade/2004 IJCAR db/conf/cade/ijcar2004.html#SteelBM04