In: Dep. Math., Karl Marx Univ. Econ, pages 22-27. Budapest, 1986.
Abstract: The purpose of this paper is to describe the relations between the class of basic Petri net's languages, so called input languages of Petri net, and the class of super-net's languages. It is given a generalization of basic Petri nets towards super-nets and self-modifying nets, and a hierarchy between them, too.