Naiqi Wu MengChu Zhou Feng Chu A Petri Net-Based Heuristic Algorithm for Realizability of Target Refining Schedule for Oil Refinery. 661-676 2008 5 IEEE T. Automation Science and Engineering 4 http://dx.doi.org/10.1109/TASE.2008.916737 db/journals/tase/tase5.html#WuZC08