1. I. I. Gikhman and A. V. Skorokhod, Introduction to the Theory of Random Processes [in Russian] Nauka (1977) (English translation of earlier edition published by Saunders Math. Books, Philadelphia (1969)).
2. R. L. Stratonovich, Selected Problems in the Theory of Fluctuations in Electronics [in Russian], Sov. Radio (1961);
3. Conditional Markov Processes and Their Application to Optimal Control Theory [in Russian], MGU (1966).
4. V. I. Klyatskin and V. I. Tatarskii, Teor. Mat. Fiz.,17, 273 (1973); Usp. Fiz. Nauk.100, 499 (1973).
5. V. I. Klyatskin, Statistical Description of Dynamical Systems with Fluctuating Parameters [in Russian], Nauka (1975).