1. Baecker, R., (ed.) Readings in Groupware and Computer Supported Cooperative Work, Morgan Kaufmann Publishers, January 1993.
2. Bales, R. F., Cohen, S. P. (1979) SYMLOG, A System for the Multiple Level Observation of Groups. The Free Press.
3. Brauer, W., Reisig, W., and Rozenberg, G. “Petri Nets” in: Advances in Petri Nets. Lecture Notes in Computer Science, vol. 254, Springer Verlag, 1987.
4. Chandy, M., and Misra, J. Parallel Program Design: A Foundation, Addison Wesley, 1988.
5. Computer Supported Cooperative Work (CSCW), An International Journal, Kluwer Academic Publishers, Vol. 1, 1992.