%0 Journal Article %A V. E. Maiorov %T Theorems of representation and best approximation in the classes $W_p^r$ and $H_p^r$ %J Doklady Akademii Nauk %D 1976 %P 293-296 %V 228 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1976_228_2_a8/ %G ru %F DAN_1976_228_2_a8