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@article{AA_1996_8_1_a0, author = {M. Sh. Birman}, title = {The discrete spectrum of the periodic {Schr\"odinger} operator perturbed by a decreasing potential}, journal = {Algebra i analiz}, pages = {3--20}, publisher = {mathdoc}, volume = {8}, number = {1}, year = {1996}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1996_8_1_a0/} }
M. Sh. Birman. The discrete spectrum of the periodic Schr\"odinger operator perturbed by a decreasing potential. Algebra i analiz, Tome 8 (1996) no. 1, pp. 3-20. http://geodesic.mathdoc.fr/item/AA_1996_8_1_a0/