Literature cited
N. N. Bogolyubov and Yu. A. Mitropol'skii, Asymptotic Methods in the Theory of Nonlinear Oscillations [in Russian], Fizmatgiz, Moscow (1963).
A. N. Filatov, Averaging Methods in Differential and Integrodifferential Equations [in Russian], Fan, Tashkent (1971).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 29, No. 3, pp. 404–410, May–June, 1977.
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van Dao, N. Asymptotic method for investigating multifrequency oscillations in quasilinear systems of second-order integrodifferential equations. Ukr Math J 29, 310–315 (1977). https://doi.org/10.1007/BF01104483
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DOI: https://doi.org/10.1007/BF01104483