%0 Journal Article %A R. M. Trigub %T Summability of multiple Fourier series and the approximation of functions on the torus by polynomials %J Doklady Akademii Nauk %D 1978 %P 276-279 %V 240 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1978_240_2_a7/ %G ru %F DAN_1978_240_2_a7