TY  - JOUR
AU  - O. V. Belyantsev
TI  - The Bessel inequality and the basis property of root functions of a second-order singular differential operator
JO  - Differencialʹnye uravneniâ
PY  - 2000
SP  - 1011
EP  - 1020
VL  - 36
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2000_36_8_a0/
LA  - ru
ID  - DE_2000_36_8_a0
ER  -