TY  - JOUR
AU  - Yu. V. Egorov
TI  - On solvability conditions for differential equations with simple characteristics
JO  - Doklady Akademii Nauk
PY  - 1976
SP  - 1310
EP  - 1312
VL  - 229
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1976_229_6_a6/
LA  - ru
ID  - DAN_1976_229_6_a6
ER  -