1. D. Allen, Jr., On a characterization of the nonregular set of primes, J. Computer and System Sciences 2, (1968), 464–467.
2. D.N. Arden, Delayed-logic and finite-state machines, in Theory of Computing Machine Design, Univers.of Michigan Press
3. Ann Arbor, Mich., 1960, 1–35 und in: Proc. 2nd Ann.Symp.on Switching Circuit Theory and Logical Design, Detroit, 1961, 133–151.
4. Y. Bar-Hillel, M. Perles, E. Shamir, On formal properties of simple phrase structure grammars, Zeitschr.f.Phonetik, Sprachwissenschaft und Kommunikationsforschung 14 (1961) 143–172.
5. B.H. Barnes, A programmer’s view of automata, Computing Surveys 4, (1972), 221–239.