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Translated fromMatematicheskie Zametki, Vol. 58, No. 3, pp. 447–451, September, 1995.
This work was supported by the International Science Foundation under grant No. MC5300.
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Belov, A.S. Some upper bounds of partial sums of a trigonometric series cannot be sharpened via lower bounds. Math Notes 58, 984–989 (1995). https://doi.org/10.1007/BF02304777
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DOI: https://doi.org/10.1007/BF02304777