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Translated from Matematicheskie Zametki, Vol. 34, No. 3, pp. 375–386, September, 1983.
The author would like to thank S. B. Stechkin for his unfailing interest in this research.
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Shadrin, A.Y. Monotone approximation of functions by trigonometric polynomials. Mathematical Notes of the Academy of Sciences of the USSR 34, 669–675 (1983). https://doi.org/10.1007/BF01140347
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DOI: https://doi.org/10.1007/BF01140347