In: 06: Bericht 267, Tagungsband des 13. Workshops Algorithmen und Werkzeuge für Petri-Netze, AWPN'06, FBI-HH-B-267, pages 32-36. September 06.
Abstract: It is shown that subclasses of minimal based object nets (MOBs), analogous to monotonous and context-free string grammars, have a decidable reachability problem.