TY  - JOUR
AU  - V. Ya. Ivrii
TI  - Conditions that the Cauchy problem for hyperbolic operators with characteristics of variable multiplicity be well posed in Gevrey classes
JO  - Doklady Akademii Nauk
PY  - 1975
SP  - 1253
EP  - 1255
VL  - 221
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1975_221_6_a1/
LA  - ru
ID  - DAN_1975_221_6_a1
ER  -