%0 Journal Article %A N. P. Korneichuk %T Diameters in $L_p$ of classes of continuous and differentiable functions and the optimal reconstruction of functions and their derivatives %J Doklady Akademii Nauk %D 1979 %P 1317-1321 %V 244 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1979_244_6_a6/ %G ru %F DAN_1979_244_6_a6