%0 Journal Article
%A Arif S. Dzhafarov
%T Certain direct and inverse theorems in the theory of best approximations of functions by algebraic polynomials
%J Doklady Akademii Nauk
%D 1969
%P 719-722
%V 187
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_187_4_a2/
%G ru
%F DAN_1969_187_4_a2