@article{DAN_1964_155_2_a11,
     author = {V. A. Tkachenko},
     title = {On the spectral analysis of the one-dimensional {Schr\"odinger} operator with a periodic complex-valued potential},
     journal = {Doklady Akademii Nauk},
     pages = {289--291},
     publisher = {mathdoc},
     volume = {155},
     number = {2},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_2_a11/}
}