%0 Journal Article
%A V. V. Kovtunets
%T Differentiability of an operator of best uniform approximation of
%J Doklady Akademii Nauk
%D 1990
%P 548-551
%V 313
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1990_313_3_a7/
%G ru
%F DAN_1990_313_3_a7