Some upper bounds of partial sums of a~trigonometric series cannot be sharpened via lower bounds
Matematičeskie zametki, Tome 58 (1995) no. 3, pp. 447-451.

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     title = {Some upper bounds of partial sums of a~trigonometric series cannot be sharpened via lower bounds},
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A. S. Belov. Some upper bounds of partial sums of a~trigonometric series cannot be sharpened via lower bounds. Matematičeskie zametki, Tome 58 (1995) no. 3, pp. 447-451. http://geodesic.mathdoc.fr/item/MZM_1995_58_3_a12/

[1] Belov A. S., Matem. sb., 183:11 (1992), 55–74 | MR | Zbl

[2] Zigmund A., Trigonometricheskie ryady, T. 1, Mir, M., 1965

[3] Belov A. S., Trudy MIAN SSSR, 190, Nauka, M., 1989, 3–21 | MR