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Translated from Matematicheskie Zametki, Vol. 41, No. 5, pp. 646–653, May, 1987.
The author thanks V. M. Tikhomirov and S. B. Stechkin for discussing the results of this note.
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Zung, D. Best linear methods for approximation of classes of periodic functions of several variables. Mathematical Notes of the Academy of Sciences of the USSR 41, 361–365 (1987). https://doi.org/10.1007/BF01159859
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DOI: https://doi.org/10.1007/BF01159859