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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 4, pp. 510–518, April, 1989.
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Telyakovskii, S.A. Approximation of functions of higher smoothness by Fourier sums. Ukr Math J 41, 444–451 (1989). https://doi.org/10.1007/BF01060623
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DOI: https://doi.org/10.1007/BF01060623