1. Bastide, R. (1995) “Approaches in unifying Petri nets and the Object-oriented Approach” Available at: http://www.dsi.unimi.it/Users/Labs/PetriLab/ws95/abstract/bastide.html
2. Bietz, A., Berry, A., Lister, A. and Raymond, K.A. (1993) “Introduction to Open Distributed Processing”, Proceedings of the ACS Queensland Branch Conference–Overcoming Isolation: The Human-Computer Connection, Townsville, Australia, pp. 27–34.
3. Billington, J., Wheeler, G. R. and Wilbur-Ham, M. C. (1988) “PROTEAN: A High-level Petri Net tool for the Specification and Verification of Communication Protocols”, IEEE Transactions on Software Engineering, Vol 14, No. 3.
4. Billington, J. (1991) “FORSEEing Quality Telecommunications Software”, Proceedings of the First Australian Conference on Telecommunications Software, ( ACTS) April 1991.
5. Dibold, H. (1992) “Hierarchical Coloured Petri Nets for the Description of Services in an Intelligent Network”, International Zurich Seminar on Digital Communications: IN and their Applications, 1992.