Geodesic
Some estimates for non-negative trigonometric polynomials and properties of these polynomials
Izvestiya. Mathematics , Tome 67 (2003) no. 4, pp. 637-653.

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We prove several new estimates for non-negative trigonometric polynomials and give some applications of these estimates. 
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A. S. Belov. Some estimates for non-negative trigonometric polynomials and properties of these polynomials. Izvestiya. Mathematics , Tome 67 (2003) no. 4, pp. 637-653. http://geodesic.mathdoc.fr/item/IM2_2003_67_4_a0/

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