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Translated from Matematicheskie Zametki, Vol. 43, No. 4, pp. 460–473, April, 1988.
The author acknowledges valuable conversations with V. V. Arestov and N. I. Chernykh, and thanks them for their interest in this paper.
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Babenko, A.G. Jackson's inequality for mean-square approximations of periodic functions by trigonometric polynomials on a uniform grid. Mathematical Notes of the Academy of Sciences of the USSR 43, 264–272 (1988). https://doi.org/10.1007/BF01139131
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DOI: https://doi.org/10.1007/BF01139131