Nonnegative trigonometric polynomials with fixed mean passing through given points
Matematičeskie zametki, Tome 62 (1997) no. 3, pp. 468-471.

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     author = {A. D. Valiev and A. S. Demidov},
     title = {Nonnegative trigonometric polynomials with fixed mean passing through given points},
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A. D. Valiev; A. S. Demidov. Nonnegative trigonometric polynomials with fixed mean passing through given points. Matematičeskie zametki, Tome 62 (1997) no. 3, pp. 468-471. http://geodesic.mathdoc.fr/item/MZM_1997_62_3_a14/

[1] Demidov A. S., Petrova V. V., Silantiev V. M., C. R. Acad. Sci. Paris. Ser. I, 323 (1996), 353–358 | MR | Zbl

[2] Polia G., Sege G., Zadachi i teoremy iz analiza, T. 2, Nauka, M., 1978