%0 Journal Article
%A A. S. Romanyuk
%T Best approximations and widths of classes of periodic functions of several variables
%J Sbornik. Mathematics
%D 2008
%P 253-275
%V 199
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_2008_199_2_a4/
%G en
%F SM_2008_199_2_a4