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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 34, No. 4, pp. 456–461, July–August, 1982.
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Matviichuk, K.S. Comparison method for systems of differential equations with a rapidly rotating phase. Ukr Math J 34, 369–374 (1982). https://doi.org/10.1007/BF01091591
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DOI: https://doi.org/10.1007/BF01091591