@article{INTD_1983_23_a0,
     author = {S. P. Novikov},
     title = {Two-dimensional {Schr\"odinger} operators in periodic fields},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya},
     pages = {3--32},
     publisher = {mathdoc},
     volume = {23},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTD_1983_23_a0/}
}