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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.25, No. 5, pp. 696–701, Sept ember–October, 1973.
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Fedorenko, L.G. On averaging in integrodifferential equations with a lag depending on the solution. Ukr Math J 25, 580–584 (1973). https://doi.org/10.1007/BF01091957
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DOI: https://doi.org/10.1007/BF01091957