TY  - JOUR
AU  - V. A. Sloushch
TI  - The discrete spectrum of differential operators in the spectral gaps in the case of nonnegative perturbations of

JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 2000
SP  - 325
EP  - 335
VL  - 270
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_2000_270_a16/
LA  - ru
ID  - ZNSL_2000_270_a16
ER  -