Geodesic
The discrete spectrum of a~two-dimensional second-order periodic elliptic operator perturbed by a~decreasing potential.~I. A~semi-infinite gap
Algebra i analiz, Tome 12 (2000) no. 4, pp. 36-78.

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     author = {M. Sh. Birman and A. Laptev and T. A. Suslina},
     title = {The discrete spectrum of a~two-dimensional second-order periodic elliptic operator perturbed by a~decreasing {potential.~I.} {A~semi-infinite} gap},
     journal = {Algebra i analiz},
     pages = {36--78},
     publisher = {mathdoc},
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     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2000_12_4_a2/}
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M. Sh. Birman; A. Laptev; T. A. Suslina. The discrete spectrum of a~two-dimensional second-order periodic elliptic operator perturbed by a~decreasing potential.~I. A~semi-infinite gap. Algebra i analiz, Tome 12 (2000) no. 4, pp. 36-78. http://geodesic.mathdoc.fr/item/AA_2000_12_4_a2/