%0 Journal Article
%A I. G. Tsar'kov
%T The inequality of Jackson type for abstract functions
%J Sbornik. Mathematics
%D 1990
%P 117-142
%V 67
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1990_67_1_a6/
%G en
%F SM_1990_67_1_a6