[1] M. A. Arbib: Automata Theory and Control Theory - A Rapprochement. Automatica 3 (1966), 161-189. Zbl 0141.28402

[2] W. DeBacker L. Verbeek: Study of Analog, Digital and Hybrid Computers Using Automata Theory. ICC Bulletin 5 (1966), 215-244.

[3] E. C. Zeeman: The Topology of the Brain and Visual Perception. In: The Topology of 3-Manifolds. Ed. by M. K. Fort, pp. 240-256. MR 0140374