%0 Journal Article %A A. S. Belov %T Some estimates for non-negative trigonometric polynomials and properties of these polynomials %J Izvestiya. Mathematics %D 2003 %P 637-653 %V 67 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2003_67_4_a0/ %G en %F IM2_2003_67_4_a0