%0 Journal Article
%A V. F. Babenko
%A S. A. Pichugov
%T Best linear approximation of some classes of differentiable periodic functions
%J Matematičeskie zametki
%D 1980
%P 683-689
%V 27
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a1/
%G ru
%F MZM_1980_27_5_a1