C. Lin, and {. Marinescu. Proceedings of the International Workshop on Petri Nets and Performance Models, page 34--43. IEEE Computer Society Press, Madison, (1987)
K. Palacz, and D. Marinescu. Proc. AAAI Spring Symposium Workshop "Bringing Knowledge to Business Processes", Standford University, CA, (March 1999)http://bond.cs.purdue.edu/docs/papers/awfms.ps.