1. Structure theory of Petri nets: the free choice hiatus;Best,1987
2. Traps characterize home states in free choice systems;Best;Theoret. Comput. Sci.,1993
3. Some classes of live and safe Petri nets;Best,1987
4. Free choice systems have home states;Best;Acta Inform.,1984
5. Réseaux de Petri: Théorie et Pratique;Brams,1983