%0 Journal Article %A B. E. Klots %T Approximation of differentiable functions by functions of large smoothness %J Matematičeskie zametki %D 1977 %P 21-32 %V 21 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1977_21_1_a2/ %G ru %F MZM_1977_21_1_a2