%0 Journal Article
%A A. K. Kushpel'
%T Sharp estimates of the widths of convolution classes in the space $C_{2\pi}$
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1987
%P 148-149
%V 180
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1987_180_a86/
%G ru
%F TM_1987_180_a86