1. Beck, C.L. and Krogh, B.H., ?Models for Simulation and Discrete Control of Manufacturing Systems,?IEEE International Conference on Robotics and Automation, San Francisco, CA, pp. 305?310 (1986).
2. Berthlot, G., Roucairol, G., and Valk, R., ?Reduction of Nets and Parallel Programs,?Proceedings of the Advanced Course on General Net Theory, Hamburg, Germany, pp. 277?290 (October 1979).
3. Bruno, G. and Biglia, P., ?Performance Evaluation and Validation of Tool Handling in Flexible Manufacturing Systems Using Petri Nets,?IEEE International Workshop on Timed Petri Nets, Torino, Italy, pp. 64?71 (July 1986).
4. Chretienne, P., ?Les Reseaux de Petri Temporises,? These d'Etat, Université Paris VI, Paris, France (1983).
5. Chao, D.Y., Chen, T.H., Wang, D.T., and Zhou, M.C., ?X Window Implementation of Petri Net Based Animation for FMS,?Proceedings of the 1992 IEEE International Conference on Systems, Man, and Cybernetics, Chicago, IL, pp. 1651?1656 (October 1992).