TY  - JOUR
AU  - S. S. Kharibegashvili
TI  - Characteristic problem for second-order strictly hyperbolic systems with two independent variables
JO  - Differencialʹnye uravneniâ
PY  - 1979
SP  - 142
EP  - 152
VL  - 15
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1979_15_1_a17/
LA  - ru
ID  - DE_1979_15_1_a17
ER  -