%0 Journal Article
%A V. A. Kondratiev
%A E. M. Landis
%T Qualitative theory of second order linear partial differential equations
%J Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya 
%D 1988
%P 99-215
%V 32
%I mathdoc
%U http://geodesic.mathdoc.fr/item/INTF_1988_32_a1/
%G ru
%F INTF_1988_32_a1