Hehua Zhang Ming Gu Xiaoyu Song Modeling and Analysis of Real-Life Job Shop Scheduling Problems by Petri nets. 279-285 2008 Annual Simulation Symposium http://doi.ieeecomputersociety.org/10.1109/ANSS-41.2008.15 conf/anss/2008 db/conf/anss/anss2008.html#ZhangGS08