TY  - JOUR
AU  - Yu. V. Egorov
TI  - On solvability conditions for equations with double characteristics
JO  - Doklady Akademii Nauk
PY  - 1977
SP  - 280
EP  - 282
VL  - 234
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1977_234_2_a4/
LA  - ru
ID  - DAN_1977_234_2_a4
ER  -