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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 36, No. 5, pp. 641–646, September–October, 1984.
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Pribegin, S.G. Approximation of functions of the class Hp in a circular ring. Ukr Math J 36, 482–486 (1984). https://doi.org/10.1007/BF01086775
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DOI: https://doi.org/10.1007/BF01086775