In: Lepistö, T.; Salomaa, A.: Lecture Notes in Computer Science, Vol. 317; Automata, Languages and Programming, pages 630-657. Berlin: Springer-Verlag, 1988.
Abstract: The paper conveys the basic concerns of net theory, and gives a brief sketch of some of the tools that have been proposed to describe the behaviour of elementary net systems. The presentation concentrates on motivations and basic definitions at the expense of stating theorems.