Discrete Spectrum of the Periodic Schrödinger Operator with a Variable Metric Perturbed by a Nonnegative Potential
1998 ◽
Vol 116
(1)
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pp. 846-855
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Keyword(s):
1974 ◽
Vol 23
(4)
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pp. 535-559
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2008 ◽
Vol 154
(2)
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pp. 311-318
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