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3. Mitropol’skii, Yu.A., Metod usredneniya v nelineinoi mekhanike (Averaging in Nonlinear Mechanics), Kiev: Naukova Dymka, 1971.
4. Arnol’d, V.I., Obyknovennye differentsial’nye uravneniya (Ordinary Differential Equations), Moscow: Nauka, 1971.
5. Arnol’d, V.I., Matematicheskie metody klassicheskoi mekhaniki (Mathematical Methods of Classical Mechanics), Moscow: Nauka, 1979.