Institut National de Recherche en Informatique et en Automatique, Le Chesnay, INRIA 1987, Rapports de Recherche No. 808, March 1987.
Abstract: Vector addition systems represent a rather wide class of model of parallelism; among them are Petri nets. In order to keep the notions of processes amd composition we introduce a new model. We show the mutual simulation of this model and Petri nets and the equality of their transition languages.