2[1]Zhou M C.Adaptive design of petri net controllers for error recovery in a utomated manufacturing systems [J].IEEE Trans On Systems,Man and Cybernetics ,1989,19: 963-973.
3[2]Alpan G,Jafari M A.Dynamic analysis of timed petri nets: a case of two processes and a shared resource [A].Proc IEEE of ICRA1997 [C],1997: 338-346.
4[3]Zhou M C,DiCesare F.Parallel and sequential mutual exclusions for petri net modeling of manufacturing systems with shared resources [J].IEEE Trans on Robotics and Automation,1991,7(4): 515-527.