@article{TM_1999_224_a17,
     author = {S. P. Novikov},
     title = {Difference {Schr\"odinger} {Operators}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {275--290},
     publisher = {mathdoc},
     volume = {224},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1999_224_a17/}
}