%0 Journal Article
%A E. M. Landis
%T Some problems of the qualitative theory of second order elliptic equations (case of several independent variables)
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1963
%P 1-62
%V 18
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1963_18_1_a0/
%G en
%F RM_1963_18_1_a0