Geodesic
Unstable points of the spectrum of a periodic difference operator
Funkcionalʹnyj analiz i ego priloženiâ, Tome 23 (1989) no. 4, pp. 87-88 
L. A. Malozemov. Unstable points of the spectrum of a periodic difference operator. Funkcionalʹnyj analiz i ego priloženiâ, Tome 23 (1989) no. 4, pp. 87-88. http://geodesic.mathdoc.fr/item/FAA_1989_23_4_a12/
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     title = {Unstable points of the spectrum of a periodic difference operator},
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[1] Skriganov M.M., Geometricheskie i arifmeticheskie metody v spektralnoi teorii mnogomernykh periodicheskikh operatorov, Trudy Matematicheskogo in-ta im. V.A. Steklova AN SSSR, 171, Nauka, L., 1985, 122 pp. | MR | Zbl

[2] Rid M., Saimon B., Metody sovremennoi matematicheskoi fiziki, t. 4, Mir, M., 1982 | MR