%0 Journal Article
%A V. L. Velikin
%T Best approximation in a Banach space by a convergent sequence of subspaces of fixed dimension
%J Doklady Akademii Nauk
%D 1987
%P 23-26
%V 294
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1987_294_1_a3/
%G ru
%F DAN_1987_294_1_a3