1. Bartlett, M. S. (1955) An Introduction to Stochastic Processes. Cambridge University Press, Cambridge.
2. Billingsley, P. (1961) Statistical Inference for Markov Processes. University of Chicago Press, Chicago.
3. Brown, B. M. (1971) Martingale central limit theorems. Ann. Math. Statist. 42, 59–66.
4. Chandrasekhar, S. (1943) Stochastic problems in physics and astronomy. Rev. Mod. Phys. 15,1–89. (Also in Selected Papers on Noise and Stochastic Processes, ed. N. Wax, Dover, New York, 1954.)
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