@article{FAA_1988_22_2_a19,
     author = {L. A. Pastur and V. A. Tkachenko},
     title = {Spectral theory of {Schr\"odinger} operators with periodic complex-valued potentials},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {85--86},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1988_22_2_a19/}
}