Literature cited
N. N. Bogolyubov and Yu. A. Mitropol'skii, Asymptotic Methods in the Theory of Nonlinear Oscillations [in Russian], Nauka, Moscow (1963).
Yu. A. Mitropol'skii and V. I. Fodchuk, “Asymptotic methods of nonlinear mechanics in application to nonlinear differential equations with retarded argument,” Ukr. Mat. Zh.,18, No. 3 (1966).
V. I. Fodchuk, “Method of averaging for differential-difference equations of neutral type,” Ukr. Mat. Zh.,20, No. 2 (1968).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 23, No. 6, pp. 745–752, November–December 1971.
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Mitropol'skii, Y.A., Fodchuk, V.I. Foundation of the method of averaging for differential-difference equations in Hilbert space. Ukr Math J 23, 607–612 (1971). https://doi.org/10.1007/BF01085083
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DOI: https://doi.org/10.1007/BF01085083