1. Abramsky, S. Eliminating local non-determinism: a new semantics for CCS. Report 290, Computer systems laboratory, Queen Mary College, London, 1981.
2. Lecture notes in computer science;Bakker,1983
3. lecture notes in computer science,1980
4. de Cindio, et al. Superposed automata nets. IF 52: Selected papers from the 1st and 2nd european workshop on applications and theory of Petri nets, 1982.
5. de Cindio, et al. Milner's CCS and Petri nets. IF 66: Selected papers from the 3rd european workshop of applications and theory of Petri nets, 1983.