TY  - JOUR
AU  - K. B. Sabitov
TI  - The maximum principle for equations of mixed type
JO  - Differencialʹnye uravneniâ
PY  - 1988
SP  - 1967
EP  - 1976
VL  - 24
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1988_24_11_a13/
LA  - ru
ID  - DE_1988_24_11_a13
ER  -