1. Bharucha-Reid, A.T.: Elements of the theory of Markov processes and their applications. New York-San Francisco-Toronto-London-Sidney: McGraw-Hill 1960
2. Wiener, N., Siegel, A., Rankin, B., Martin, W.T.: Differential Space, Quantum Systems and Prediction. Cambridge-London: The M.I.T. Press 1966
3. Onsager, L., Machlup, S.: Phys. Rev.91, 1505 (1953)
4. Tisza, L., Manning, J.: Phys. Rev.105, 1695 (1957)
5. Springer Tracts in Modern Physics, Vol. 66,1973