@article{DAN_1980_250_6_a1,
     author = {O. A. Veliev},
     title = {The one-dimensional {Schr\"odinger} operator with a periodic complex-valued potential},
     journal = {Doklady Akademii Nauk},
     pages = {1292--1296},
     publisher = {mathdoc},
     volume = {250},
     number = {6},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_250_6_a1/}
}