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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 22, No. 4, pp. 481–493, July–August, 1970.
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Dzyadyk, V.K., Gavrilyuk, V.T. & Stepanets, A.I. Exact upper bound for approximations on classes of differential periodic functions using Rogosinski polynomials. Ukr Math J 22, 411–421 (1970). https://doi.org/10.1007/BF01090766
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DOI: https://doi.org/10.1007/BF01090766