TY  - JOUR
AU  - K. B. Sabitov
TI  - The maximum principle for systems of second-order equations of
JO  - Doklady Akademii Nauk
PY  - 1989
SP  - 783
EP  - 786
VL  - 305
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1989_305_4_a2/
LA  - ru
ID  - DAN_1989_305_4_a2
ER  -