Literature Cited
I. M. Glazman, Direct Methods in the Qualitative Analysis of Singular Differential Operators [in Russian], Nauka, Moscow (1965).
A. V. Marchenko, Mat. Sb.,96, 276–293 (1975).
Additional information
L. D. Landau Institute of Theoretical Physics. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 11, No. 2, pp. 85–86, April–June, 1977.
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Marchenko, A.V. The spectrum of a Sturm — Liouville operator with almost-periodic potential. Funct Anal Its Appl 11, 151–153 (1977). https://doi.org/10.1007/BF01081897
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DOI: https://doi.org/10.1007/BF01081897