Roland Bouroulet Raymond R. Devillers Hanna Klaudel Elisabeth Pelz Franck Pommereau Modeling and Analysis of Security Protocols Using Role Based Specifications and Petri Nets. 72-91 2008 Petri Nets http://dx.doi.org/10.1007/978-3-540-68746-7_9 conf/apn/2008 db/conf/apn/pn2008.html#BourouletDKPP08