%0 Journal Article
%A V. B. Kolmanovskii
%T Solutions of constant sign for equations of neutral type
%J Differencialʹnye uravneniâ
%D 1971
%P 1116-1119
%V 7
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1971_7_6_a19/
%G ru
%F DE_1971_7_6_a19