Petri Nets and Other Models of Concurrency – ICATPN 2007 28th International Conference on Applications and Theory of Petri Nets and Other Models of Concurrency, ICATPN 2007, Siedlce, Poland, June 25-29, 2007. Proceedings - Kleijn, Jetty; Yakovlev, Alex (Springer Berlin Heidelberg, 2007)