%0 Journal Article
%A V. I. Berdyshev
%T Variation of the norms in the problem of best approximation
%J Matematičeskie zametki
%D 1981
%P 181-196
%V 29
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1981_29_2_a2/
%G ru
%F MZM_1981_29_2_a2