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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 26, No. 5, pp. 634–645, September–October, 1974.
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Fodchuk, V.I., Kholmatov, A. Towards a theory of the asymptotic method of Krylov-Bogolyubov for differential-functional equations. Ukr Math J 26, 518–526 (1974). https://doi.org/10.1007/BF01085278
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DOI: https://doi.org/10.1007/BF01085278