1. I. A. Kvasnikov, Thermodynamics and Statistical Physics, Vol. 2: Theory of Equilibrium Systems (URSS, Moscow, 2002) [in Russian].
2. R. Feinman, Statistical Mechanics (Benjamin, Massachusetts, 1972).
3. L. D. Landau and E. M. Livshitz, Course of Theoretical Physics, Vol. 5: Statistical Physics (Fizmatlit, Moscow, 2002; Pergamon, Oxford, 1980).
4. J. W. Gibbs, Elementary Principles of Statistical Mechanics (Ox Bow Press, Woodbridge, 1981).
5. N. N. Bogolyubov, Selected Works, in 3 Volumes (Naukova Dumka, Kiev, 1970), Vol. 2, p. 297 [in Russian].