1. Doob, J.L.: Stochastic processes. New York 1953.
2. Loeve, Michel: Probability methods in Physics. Mimeographed notes of a Seminar. Berkeley: University of California 1948 – 49.
3. Bartlett, M. S.: Stochastic processes. Cambridge 1955.
4. Doob, J.L.: Stochastic processes. New York 1953.
5. Uspensky, J. V.: Introduction to mathematical probability. New York 1937.