@article{AA_1996_8_2_a9,
     author = {O. L. Safronov},
     title = {The discrete spectrum in gaps of the continuous spectrum for indefinite-sign perturbations with a large coupling constant},
     journal = {Algebra i analiz},
     pages = {162--194},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1996_8_2_a9/}
}