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Additional information
L. D. Landau Theoretical Physics Institute, Academy of Sciences of the USSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 19, No. 1, pp. 42–48, January–March, 1985.
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Sinai, Y.G. Structure of the spectrum of the Schrödinger operator with almost-periodic potential in the vicinity of its left edge. Funct Anal Its Appl 19, 34–39 (1985). https://doi.org/10.1007/BF01086023
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DOI: https://doi.org/10.1007/BF01086023