1. Sequential and Concurrent Behaviour in Petri Net Theory;Best,1987
2. Interleaving and partial orders in concurrency: a formal comparison;Best,1987
3. Axiomatizing net computations and processes;Degano,1989
4. Axiomatizing the Algebra of Net Computations and Processes;Degano;Acta Informatica,1996
5. Branching processes of Petri nets;Engelfriet;Acta Inform.,1991