@article{IIMI_2006_36_2_a20,
     author = {N. I. Pletnikova},
     title = {On levels of the one-dimensional {Schr\"odinger} operator on the boundary of the essential spectrum},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {91--94},
     publisher = {mathdoc},
     volume = {36},
     number = {2},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2006_36_2_a20/}
}