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2. A. P. Markeev, Libration Points in Celestial Mechanics and Astrodynamics [in Russian], Nauka, Moscow (1978).
3. A. P. Markeev, “Stability of Hamiltonian systems,” in: V. M. Matrosov, V. V. Rumyantsev, and A. V. Karapetyan (editors), Nonlinear Mechanics [in Russian], Fizmatlit, Moscow (2001), pp 114–130.
4. N. N. Bogolyubov and Yu. A. Mitropol’skii, Asymptotic Methods in the Theory of Nonlinear Oscillations [in Russian], Nauka, Moscow (1974).
5. Yu. A. Mitropol’skii, The Averaging Method in Nonlinear Mechanics [in Russian], Naukova Dumka, Kiev (1971).