%0 Journal Article
%A S. A. Telyakovskii
%T Approximation of differentiable functions by de la Vall\'ee Poussin's sums
%J Doklady Akademii Nauk
%D 1958
%P 426-429
%V 121
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_121_3_a7/
%G ru
%F DAN_1958_121_3_a7