%0 Journal Article %A V. V. Zhuk %T The approximation of periodic functions by linear approximation methods %J Doklady Akademii Nauk %D 1968 %P 1038-1041 %V 179 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1968_179_5_a7/ %G ru %F DAN_1968_179_5_a7