1. Rabin M. O.: "Probabilistic automata", Inform. and Control 6 (1963), 230–245.
2. Rabin M. O.: "Lectures on classical and probabilistic automata", in Automata Theory (E. R. Caianiello, ed.), Academic Press, New York (1966).
3. Lorenz A. A.: Stochastic Automata — Constructive Theory, Halsted Press — Wiley, New York (1974).
4. Podnieks K. M.: "On cut-points of some finite stochastic automata", Avtomat. i Vychisl. Tekhn. 5 (1970) (Russian).
5. Metra I. A., A. A. Smilgais: "On some possibilities of representation of nonregular events by stochastic automata", in Latviiskii matematicheskii ezhegodnik 3, Riga, Zinatne (1968) (Russian).