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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 38, No. 6, pp. 755–762, November–December, 1986.
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Stepanets, A.I. Approximation by Fourier sums of functions with slowly decreasing Fourier coefficients. Ukr Math J 38, 637–644 (1986). https://doi.org/10.1007/BF01056650
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DOI: https://doi.org/10.1007/BF01056650