Fausto Sessego Alessandro Giua Carla Seatzu HYPENS: A Matlab Tool for Timed Discrete, Continuous and Hybrid Petri Nets. 419-428 2008 Petri Nets http://dx.doi.org/10.1007/978-3-540-68746-7_28 conf/apn/2008 db/conf/apn/pn2008.html#SessegoGS08