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Translated from Matematicheskie Zametki, Vol. 26, No. 5, pp. 791–804, November, 1979.
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Andreev, A., Popov, V.A. & Sendov, B. Jackson-type theorems for best one-sided aproximations by trigonometrical polynomials and splines. Mathematical Notes of the Academy of Sciences of the USSR 26, 889–896 (1979). https://doi.org/10.1007/BF01159203
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DOI: https://doi.org/10.1007/BF01159203