%0 Journal Article
%A Yu. K. Metlyaev
%T The use of operators that have certain properties in qualitative investigations of differential equations
%J Differencialʹnye uravneniâ
%D 1970
%P 1976-1981
%V 6
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1970_6_11_a5/
%G ru
%F DE_1970_6_11_a5