%0 Journal Article %A V. A. Sloushch %T Discrete spectrum in the spectral gaps of a selfadjoint operator for unbounded perturbations %J Zapiski Nauchnykh Seminarov POMI %D 1997 %P 237-241 %V 247 %U http://geodesic.mathdoc.fr/item/ZNSL_1997_247_a14/ %G ru %F ZNSL_1997_247_a14