%0 Journal Article
%A E. S. Gubanova
%T A problem in the theory of second-order elliptic equations in the plane
%J Differencialʹnye uravneniâ
%D 1986
%P 1609-1610
%V 22
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1986_22_9_a17/
%G ru
%F DE_1986_22_9_a17