%0 Journal Article %A N. S. Nikol'skaya %T Approximation of differentiable functions of several variables by Fourier sums in the $L_p$ metric %J Doklady Akademii Nauk %D 1973 %P 1282-1285 %V 208 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1973_208_6_a5/ %G ru %F DAN_1973_208_6_a5