Roberto Gorrieri Fabio Martinelli Process Algebraic Frameworks for the Specification and Analysis of Cryptographic Protocols. 46-67 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2747&spage=46 2003 conf/mfcs/2003 MFCS db/conf/mfcs/mfcs2003.html#GorrieriM03