TY  - JOUR
AU  - V. D. Budaev
TI  - On the Bessel inequality for systems of root functions of
JO  - Doklady Akademii Nauk
PY  - 1991
SP  - 16
EP  - 20
VL  - 318
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1991_318_1_a1/
LA  - ru
ID  - DAN_1991_318_1_a1
ER  -