In: Akademiya Nauk SSSR; Programmirovanie, No. 4, pages 27-32. 1989. In Russian.
Abstract: The author studies a class of languages that belong to the class of context-free languages and the class of languages that can be generated by Petri nets. The author determines the closure properties and defines a class of models that generates the languages belonging to this class.
Keywords: net language; context-free language; closure property.