In: LNCS 2300: Formal and Natural Computing, pages 220-pp. Essays Dedicated to Grzegorz Rozenberg / W. Brauer, H. Ehrig, J. Karhumäki, A. Salomaa (Eds.) --- Springer Verlag, February 2002.
Abstract: It is demonstrated how Petri nets may be used to control the derivations in systems of cooperating grammars. This allows to define grammar systems with a concurrent rewriting protocol. Some basic properties are established.