1. Kriterij predstavimosti sobytij v konechnykh verojatnostnykh avtomatakh;Bukharaev,1967
2. Irrational Numbers;Niven,1956
3. Equivalences between probabilistic and deterministic sequential machines;Page;Inform. Control,1966
4. Some aspects of probabilistic automata;Paz;Inform. Control,1966
5. On probabilistic automata with one input letter;Salomaa;Ann. Univ. Turku. Ser. A,1965