In: Programmirovanie, Vol. 13, No. 3, pages 3-10. May-June 1987. In Russian.
Also in: Programming and Computer Software, Vol. 13, No. 3, pages 95-100. May-June 1987. English translation.
Abstract: The known advantages of Petri nets are combined with those of pushdown automata in the framework of a more powerful abstract system with good modeling capabilities.