@article{FAA_1989_23_4_a12,
     author = {L. A. Malozemov},
     title = {Unstable points of the spectrum of a periodic difference operator},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {87--88},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1989_23_4_a12/}
}