%0 Journal Article
%A Yu. A. Pykh
%T Differential systems with non-negative normed solutions
%J Differencialʹnye uravneniâ
%D 1977
%P 1138-1140
%V 13
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_6_a22/
%G ru
%F DE_1977_13_6_a22