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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 37, No. 4, pp. 437–443, July–August, 1985.
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Golets, B.I., Golets, V.L. & Petrishin, R.I. Averaging with respect to a fast variable in triple-frequency systems of second approximation. Ukr Math J 37, 346–351 (1985). https://doi.org/10.1007/BF01055946
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DOI: https://doi.org/10.1007/BF01055946