%0 Journal Article
%A N. P. Korneichuk
%T Inequalities for differentiable periodic functions and best approximation of one class of functions by another
%J Izvestiya. Mathematics 
%D 1972
%P 417-428
%V 6
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1972_6_2_a5/
%G en
%F IM2_1972_6_2_a5