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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 33, No. 3, pp. 356–367, May–June, 1981.
The principal result has been formulated in [8].
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Stepanets, A.I. Simultaneous approximation of periodic functions and their derivatives by fourier sums. Ukr Math J 33, 274–282 (1981). https://doi.org/10.1007/BF01085566
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DOI: https://doi.org/10.1007/BF01085566