TY  - JOUR
AU  - A. A. Novruzov
TI  - On the regularity of boundary points for second order equations with nonnegative characteristic form
JO  - Doklady Akademii Nauk
PY  - 1976
SP  - 1039
EP  - 1042
VL  - 230
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1976_230_5_a6/
LA  - ru
ID  - DAN_1976_230_5_a6
ER  -