The Rotation Number for Almost Periodic Schrödinger Operators with $$\delta $$-Potentials
1984 ◽
Vol 124
(1-3)
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pp. 61-77
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2003 ◽
Vol 283
(2)
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pp. 570-581
2012 ◽
Vol 176
(2)
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pp. 1039-1096
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