@article{DAN_1983_268_6_a0,
     author = {O. A. Veliev},
     title = {The spectrum of the {Schr\"odinger} operator with periodic potential},
     journal = {Doklady Akademii Nauk},
     pages = {1289--1292},
     year = {1983},
     volume = {268},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_268_6_a0/}
}