Geodesic
The discrete spectrum in the gaps of a second-order perturbed periodic operator
Funkcionalʹnyj analiz i ego priloženiâ, Tome 25 (1991) no. 2, pp. 89-92 
M. Sh. Birman. The discrete spectrum in the gaps of a second-order perturbed periodic operator. Funkcionalʹnyj analiz i ego priloženiâ, Tome 25 (1991) no. 2, pp. 89-92. http://geodesic.mathdoc.fr/item/FAA_1991_25_2_a18/
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     title = {The discrete spectrum in the gaps of a second-order perturbed periodic operator},
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     number = {2},
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     url = {http://geodesic.mathdoc.fr/item/FAA_1991_25_2_a18/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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