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Translated from Matematicheskie Zametki, Vol. 42, No. 6, pp. 790–809, December, 1987.
The author thanks S. B. Stechkin for directing the work.
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Shadrin, A.Y. Jackson-type theorems for monotone approximation of functions by trigonometric polynomials. Mathematical Notes of the Academy of Sciences of the USSR 42, 933–944 (1987). https://doi.org/10.1007/BF01137449
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DOI: https://doi.org/10.1007/BF01137449