%0 Journal Article
%A Yu. V. Egorov
%A V. A. Kondrat'ev
%T On the negative spectrum of an elliptic operator
%J Informatics and Automation
%D 1990
%P 61-67
%V 192
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TRSPY_1990_192_a5/
%G ru
%F TRSPY_1990_192_a5