%0 Journal Article
%A I. G. Tsar'kov
%T Widths and Jackson's type inequality for abstract functions
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1992
%P 219-231
%V 198
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1992_198_a11/
%G ru
%F TM_1992_198_a11