%0 Journal Article %A A. S. Belov %T On upper estimates of the~partial sums of a~trigonometric series in terms of lower estimates %J Sbornik. Mathematics %D 1994 %P 313-330 %V 77 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1994_77_2_a4/ %G en %F SM_1994_77_2_a4