TY  - JOUR
AU  - K. B. Sabitov
TI  - Maximum modulus principles for some classes of second-order
JO  - Doklady Akademii Nauk
PY  - 1989
SP  - 1321
EP  - 1324
VL  - 309
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1989_309_6_a9/
LA  - ru
ID  - DAN_1989_309_6_a9
ER  -