TY  - JOUR
AU  - M. E. Lerner
TI  - A maximum principle for hyperbolic equations and its application to equations of mixed type
JO  - Doklady Akademii Nauk
PY  - 1967
SP  - 1269
EP  - 1272
VL  - 177
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1967_177_6_a4/
LA  - ru
ID  - DAN_1967_177_6_a4
ER  -