TY  - JOUR
AU  - V. A. Kondrat'ev
AU  - E. M. Landis
TI  - Semilinear equations of second order with nonnegative characteristic form
JO  - Matematičeskie zametki
PY  - 1988
SP  - 457
EP  - 468
VL  - 44
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1988_44_4_a4/
LA  - ru
ID  - MZM_1988_44_4_a4
ER  -