Robin Bergenthum Robert Lorenz Sebastian Mauser Faster Unfolding of General Petri Nets Based on Token Flows. 13-32 2008 Petri Nets http://dx.doi.org/10.1007/978-3-540-68746-7_6 conf/apn/2008 db/conf/apn/pn2008.html#BergenthumLM08