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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 27, No. 4, p. 571, July–August, 1975.
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Martynyuk, A.A. To the editor, Ukrainian Mathematical Journal. Ukr Math J 27, 475 (1975). https://doi.org/10.1007/BF01085603
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DOI: https://doi.org/10.1007/BF01085603