%0 Journal Article
%A V. A. Levin
%T Approximation of differentiable functions by positive methods of summation of Fourier series
%J Matematičeskie zametki
%D 1983
%P 515-519
%V 34
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a3/
%G ru
%F MZM_1983_34_4_a3