Geodesic
An example of a periodic magnetic Schrödinger in operator with degenerate lower edge of the spectrum
Algebra i analiz, Tome 16 (2004) no. 2, pp. 177-185 
R. G. Shterenberg. An example of a periodic magnetic Schrödinger 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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     author = {R. G. Shterenberg},
     title = {An example of a periodic magnetic {Schr\"odinger} in operator with degenerate lower edge of the spectrum},
     journal = {Algebra i analiz},
     pages = {177--185},
     year = {2004},
     volume = {16},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2004_16_2_a6/}
}
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