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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 4, pp. 761–780, July–August, 1975.
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Nikol'skaya, N.S. Approximation of periodic functions of the class\(SH\mathop *\limits_p^r \) by Fourier sums. Sib Math J 16, 582–596 (1975). https://doi.org/10.1007/BF00967132
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DOI: https://doi.org/10.1007/BF00967132