1. N. N. Bogolyubov, On Some Statistical Methods in Mathematical Physics (Izd-vo Akad. Nauk USSR, Moscow, 1945).
2. N. N. Bogolyubov and Yu. A. Mitropol’skii, Asymptotic Methods in the Theory of Nonlinear Fluctuations (Fizmatlit, Moscow, 1974; Gordon and Breach, New York, 1961).
3. Yu. A. Mitropol’skii, Averaging Method in Nonlinear Mechanics (Naukova Dumka, Kiev, 1971).
4. V. I. Yudovich, “Vibration dynamics of systems with constraints,” Dokl. Phys. 42, 322–325 (1997).
5. V. B. Levenshtam, “Justification of the averaging method for a system of equations with the Navier–Stokes operator in the principal part,” St. Petersburg Math. J. 26, 69–90 (2014). https://doi.org/10.1090/S1061-0022-2014-01331-3