Jordi Cortadella Wolfgang Reisig Applications and Theory of Petri Nets 2004, 25th International Conference, ICATPN 2004, Bologna, Italy, June 21-25, 2004, Proceedings ICATPN Lecture Notes in Computer Science 3099 Springer 2004 3-540-22236-7 db/conf/apn/icatpn2004.html