%0 Journal Article
%A G. V. Radzievskii
%T Direct and converse theorems in problems of approximation by vectors of finite degree
%J Sbornik. Mathematics
%D 1998
%P 561-601
%V 189
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1998_189_4_a3/
%G en
%F SM_1998_189_4_a3