TY  - JOUR
AU  - Z. O. Mel'nik
TI  - Hyperbolic equations with multiple characteristics
JO  - Differencialʹnye uravneniâ
PY  - 1974
SP  - 1530
EP  - 1532
VL  - 10
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1974_10_8_a22/
LA  - ru
ID  - DE_1974_10_8_a22
ER  -