B. Cohen. Overview. In Claude Girault, Wolfgang Reisig, editors, Application and Theory of Petri Nets, Selected Papers from the First and the Second European Workshop on Application and Theory of Petri Nets, Stasbourg 23.-26. September 1980, Bad Honnef 28.-30. September 1981. Volume 52 of Informatik-Fachberichte, pages 31, Springer, 1981.
Abstract is missing.