1. Dassow, J., Pâun, G.: Regular rewriting in formal language theory. (EATCS Monographs on Theoretical Computer Science) Berlin, Heidelberg, New York: Springer 1989
2. Ginsburg, S., Greibach, S., Harrison, M.A.: One-way stack automata. J. ACM14, 389?418 (1967)
3. Hauschildt, D. Semilinearity of the reachability set is decidable for Petri nets. Doctoral Thesis, Dept. of Computer Science, University of Hamburg (1990). Also appeared as: Dept. of Computer Science, University of Hamburg, Technical Report No. FBI-HH-B-146/90
4. Kosaraju, S.R. Decidability of reachability in vector addition systems. Proc. 14th Ann. ACM STOC (1982), pp. 267-281
5. Kleine Büning, H., Lettmann, T., Mayr, E.: Projections of vector addition system reachability sets are semilinear, TCS64, 343?350 (1989)