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Translated from Matematicheskie Zametki, Vol. 36, No. 1, pp. 123–136, July, 1984.
The author sincerely thanks S. B. Stechkin for suggesting the problem and his interest.
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Baiborodov, S.P. Approximation of functions of several variables by Fejer sums. Mathematical Notes of the Academy of Sciences of the USSR 36, 553–561 (1984). https://doi.org/10.1007/BF01139559
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DOI: https://doi.org/10.1007/BF01139559