TY  - JOUR
AU  - N. B. Kerimov
TI  - On necessary and sufficient conditions for the basis property of systems of root functions of a differential operator
JO  - Differencialʹnye uravneniâ
PY  - 1996
SP  - 37
EP  - 43
VL  - 32
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1996_32_1_a5/
LA  - ru
ID  - DE_1996_32_1_a5
ER  -