%0 Journal Article
%A N. P. Korneichuk
%T Upper bounds of best approximations on classes of differentiable periodic functions in the metrics $C$ and $L$
%J Doklady Akademii Nauk
%D 1970
%P 269-271
%V 190
%N 2
%U http://geodesic.mathdoc.fr/item/DAN_1970_190_2_a4/
%G ru
%F DAN_1970_190_2_a4