TY  - JOUR
AU  - A. G. Terent'ev
TI  - Certain properties of linear differential operators
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 1635
EP  - 1641
VL  - 5
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_9_a9/
LA  - ru
ID  - DE_1969_5_9_a9
ER  -