%0 Journal Article
%A V. T. Shevaldin
%T Lower estimates of the widths of the classes of functions defined by a modulus of continuity
%J Izvestiya. Mathematics 
%D 1995
%P 399-415
%V 45
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1995_45_2_a7/
%G en
%F IM2_1995_45_2_a7