Kamel Barkaoui Jean-Michel Couvreur Claude Dutheillet On Liveness in Extended non Self-Controlling Nets. 25-44 1995 conf/apn/1995 Application and Theory of Petri Nets db/conf/apn/apn95.html#BarkaouiCD95 http://dx.doi.org/10.1007/3-540-60029-9_32