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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 4, pp. 436–441, April, 1989.
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Stepanets, A.I. Dzydyk's research on the theory of approximation of periodic functions. Ukr Math J 41, 379–383 (1989). https://doi.org/10.1007/BF01060613
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DOI: https://doi.org/10.1007/BF01060613