1. S. V. Peletminskii, A. I. Sokolovskii, and V. S. Shchelokov, Teor. Mat. Fiz.,30, 57 (1977).
2. N. N. Bogolyubov, ?Problems of a dynamical theory in statistical physics,? in: Studies in Statistical Mechanics, Vol. 1 (eds. J. de Boer and G. E. Uhlenbeck), North-Holland, Amsterdam (1962).
3. N. N. Bogolyubov, Preprint JINR R-1395 [in Russian], Dubna (1963).
4. S. V. Peletminskii and A. I. Sokolovskii, Teor. Mat. Fiz.,18, 121 (1974).
5. L. D. Landau, Zh. Eksp. Teor. Fiz.,11, 592 (1941).