Wolfgang Coy. Automata in Labyrinths. In Marek Karpinski, editor, Fundamentals of Computation Theory, Proceedings of the 1977 International FCT-Conference, Poznan-Kórnik, Poland, September 19-23, 1977. Volume 56 of Lecture Notes in Computer Science, pages 65-71, Springer, 1977.
Abstract is missing.