TY  - JOUR
AU  - E. V. Radkevich
TI  - A priori estimates and hypoelliptic operators with multiple characteristics
JO  - Doklady Akademii Nauk
PY  - 1969
SP  - 274
EP  - 277
VL  - 187
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1969_187_2_a10/
LA  - ru
ID  - DAN_1969_187_2_a10
ER  -