1. V. P. Maslov, Perturbation Theory and Asymptotic Methods (Izd. Moskov. Univ., Moscow, 1965; Dunod, Paris, 1972) [in Russian and French].
2. B. B. Kadomtsev, Dynamics and Information (Editorial Board of the journal Uspekhi Fiz. Nauk, Moscow, 1999).
3. A. N. Shiryaev, Probability. Vol. 1: Elementary Probability Theory. Mathematical Foundations. Linit Theorems (MCCME, Moscow, 2004) [in Russian].
4. L. D. Landau and E. M. Lifshits, Statistical Physics (Nauka, Moscow, 1964) [in Russian].
5. V. P. Maslov, “On the Number of Eigenvalues for a Gibbs Ensemble of Self-Adjoint Operators,” Mat. Zametki 83(3), 465–467 (2008) [Math. Notes 83 (3–4), 424–427 (2008)].