1. Cardoso, J.R., Valette, Dubois, D., 1996. Fuzzy Petri Nets: An Overview. In 13th IFAC World Congress, San Francisco USA, 30 June–5 July 1996, vol. J, pp. 443–448.
2. A fuzzy Petri net for knowledge representation and reasoning;Garg;Information Processing Letters,1991
3. High-level Petri Nets: Theory and Applications,1991
4. Kim, J.H., Lee, S.J., Seong, P.H., 2000. Feasibility Study on Use of Virtual Collaborator for Remote NPP Control, Proceedings of the Korea Nuclear Society Spring, May 2000, Cheju, Korea.
5. Lee, S.J., Seong, P.H., 2001. Automated Computer-Based Procedure System for Remote Operation System. Proceedings of the Korea Nuclear Society Autumn, Oct 2001, Seoul, Korea.