TY  - JOUR
AU  - V. A. Kondratiev
AU  - E. M. Landis
TI  - Qualitative theory of second order linear partial differential equations
JO  - Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya 
PY  - 1988
SP  - 99
EP  - 215
VL  - 32
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/INTF_1988_32_a1/
LA  - ru
ID  - INTF_1988_32_a1
ER  -