1. Ya. G. Sinai, Russ. Math. Surveys, 25, 137–189 (1970).
2. N. S. Krylov, Works on the Foundations of Statistical Physics [in Russian], Acad. Sci. USSR, Moscow (1950); English transl., Princeton Univ. Press, Princeton (1979).
3. A. N. Kolmogorov, Foundations of the Theory of Probability [in Russian], Nauka, Moscow (1974); English transl. prev. ed., Chelsea, New York (1956).
4. G. A. Gal’perin and A. N. Zemlyakov, Mathematical Billiards [in Russian], Nauka, Moscow (1990).
5. V. I. Arnold and A. Avez, Problèmes ergodiques de la mécanique classique [in Russian], RKhD, Izhevsk (1999); French transl. prev. ed. (Monogr. Internat. Math. Modernes, Vol. 9), Gauthier-Villars, Paris (1967).