%0 Journal Article
%A A. A. Ligun
%T Exact constants of approximation for differentiable periodic functions
%J Matematičeskie zametki
%D 1973
%P 21-30
%V 14
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1973_14_1_a2/
%G ru
%F MZM_1973_14_1_a2