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Additional information
Translated from Matematicheskie Zametki, Vol. 34, No. 4, pp. 515–519, October, 1983.
The author expresses gratitude to V. A. Baskakov for making several remarks about this note and pointing out [7, 9] to the author.
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Levin, V.A. Approximation of differentiable functions by positive methods of summation of Fourier series. Mathematical Notes of the Academy of Sciences of the USSR 34, 748–750 (1983). https://doi.org/10.1007/BF01157391
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DOI: https://doi.org/10.1007/BF01157391