%0 Journal Article
%A A. L. Teptin
%T On the question of the sign of the Green function
%J Differencialʹnye uravneniâ
%D 1983
%P 1542-1547
%V 19
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_9_a9/
%G ru
%F DE_1983_19_9_a9