TY  - JOUR
AU  - V. Ya. Ivrii
TI  - The Cauchy problem for nonstrictly hyperbolic equations
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 517
EP  - 519
VL  - 197
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_197_3_a2/
LA  - ru
ID  - DAN_1971_197_3_a2
ER  -