TY  - JOUR
AU  - V. M. Petkov
TI  - Necessary conditions for the correctness of the Cauchy problem for hyperbolic systems with multiple characteristics
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1972
VL  - 27
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1972_27_4_a22/
LA  - ru
ID  - RM_1972_27_4_a22
ER  -