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Translated from Matematicheskie Zametki, Vol. 41, No. 1, pp. 57–70, January, 1987.
The author is grateful to V. A. Il'in and E. I. Moiseev for the detailed discussion of the results of this paper.
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Salimov, Y.S. Equiconvergence of the Riesz means of expansions, corresponding to an N-fold system of exponents and to the N-fold fourier integral. Mathematical Notes of the Academy of Sciences of the USSR 41, 35–44 (1987). https://doi.org/10.1007/BF01159527
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DOI: https://doi.org/10.1007/BF01159527