TY  - JOUR
AU  - I. V. Gel'man
TI  - Stability of normally solvable extensions of partial differential operators
JO  - Doklady Akademii Nauk
PY  - 1966
SP  - 1239
EP  - 1242
VL  - 170
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1966_170_6_a0/
LA  - ru
ID  - DAN_1966_170_6_a0
ER  -