@article{ZNSL_1997_247_a14,
     author = {V. A. Sloushch},
     title = {Discrete spectrum in the spectral gaps of a~selfadjoint operator for unbounded perturbations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {237--241},
     publisher = {mathdoc},
     volume = {247},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_247_a14/}
}