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Translated from Matematicheskii Zametki, Vol. 27, No. 1, pp. 33–48, January, 1980.
The author thanks S. B. Stechkin for guidance and for his constant interest in this work.
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Baiborodov, S.P. Approximation of functions by Vallée-Poussin sums. Mathematical Notes of the Academy of Sciences of the USSR 27, 19–27 (1980). https://doi.org/10.1007/BF01149809
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DOI: https://doi.org/10.1007/BF01149809