@article{IIMI_2005_1_a3,
     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 = {107--112},
     year = {2005},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2005_1_a3/}
}