%0 Journal Article
%A E. E. Bukzhalev
%T On the Construction of Upper and Lower Solutions by the Nagumo Method
%J Differencialʹnye uravneniâ
%D 2004
%P 723-730
%V 40
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_2004_40_6_a0/
%G ru
%F DE_2004_40_6_a0