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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 23, No. 2, pp. 147–156, March–April, 1971.
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Korenevskii, D.G. On the principle of averaging for second-order hyperbolic equations with functionally perturbed argument. Ukr Math J 23, 125–132 (1971). https://doi.org/10.1007/BF01086602
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DOI: https://doi.org/10.1007/BF01086602