%0 Journal Article
%A I. A. Shevchuk
%T On co-approximation of monotone functions
%J Doklady Akademii Nauk
%D 1989
%P 537-541
%V 308
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1989_308_3_a5/
%G ru
%F DAN_1989_308_3_a5