TY  - JOUR
AU  - V. D. Budaev
TI  - Criteria for the Bessel property and the Riesz basis property of systems of root functions of differential operators. II
JO  - Differencialʹnye uravneniâ
PY  - 1992
SP  - 23
EP  - 33
VL  - 28
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1992_28_1_a2/
LA  - ru
ID  - DE_1992_28_1_a2
ER  -