An example of a periodic magnetic Schr\"odinger in operator with degenerate lower edge of the spectrum
Algebra i analiz, Tome 16 (2004) no. 2, pp. 177-185.

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R. G. Shterenberg. An example of a periodic magnetic Schr\"odinger in operator with degenerate lower edge of the spectrum. Algebra i analiz, Tome 16 (2004) no. 2, pp. 177-185. http://geodesic.mathdoc.fr/item/AA_2004_16_2_a6/

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[RSi] Rid M., Saimon B., Metody sovremennoi matematicheskoi fiziki. T. 4. Analiz operatorov, Mir, M., 1982 | MR

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