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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 22, No. 4, pp. 503–513, July–August, 1970.
The author expresses his deep gratitude to M. A. Krasnosel'skii for a discussion of the results and for valuable advice.
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Strygin, V.V. The averaging principle for equations with heredity. Ukr Math J 22, 430–439 (1970). https://doi.org/10.1007/BF01090768
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DOI: https://doi.org/10.1007/BF01090768