Lawrence Cabac Daniel Moldt Heiko Rölke A Proposal for Structuring Petri Net-Based Agent Interaction Protocols. 102-120 2003 conf/apn/2003 ICATPN http://link.springer.de/link/service/series/0558/bibs/2679/26790102.htm db/conf/apn/icatpn2003.html#CabacMR03