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Translated from Matematicheskie Zametki, Vol. 50, No. 4, pp. 21–27, October, 1991.
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Belov, A.S. Partial sums of a trigonometric series with convex coefficients. Mathematical Notes of the Academy of Sciences of the USSR 50, 1000–1004 (1991). https://doi.org/10.1007/BF01137726
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DOI: https://doi.org/10.1007/BF01137726