1. R. Alquézar, A. Sanfeliu: An algebraic framework to represent finite state machines in single-layer recurrent neural networks. Neural Computation, No. 7, 931–949 (1995).
2. R. Alquézar, A. Sanfeliu, J. Cueva: Learning of context-sensitive language acceptors through regular inference and constraint induction. In: Proc. ICGI'96, L.Miclet and C.de la Higuera (eds.), Springer-Verlag, Lecture Notes in Artificial Intelligence 1147, 134–145, 1996.
3. H. Bordihn, H. Fernau: Accepting grammars and systems. TR 9/94, Universität Karlsruhe, Fakultät für Informatik 1994.
4. H. Fernau, H. Bordihn: Remarks on accepting parallel systems. Intern. J. Computer Math., vol. 56, 51–67.
5. H. Fernau, M. Holzer, H. Bordihn: Accepting multi-agent systems: the case of cooperating distributed grammar systems. Computers and Artificial Intelligence, vol. 15 (1996), No. 2–3, 123–139.