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Translated from Teoriya Funktsii, Funktsional'nyi Analiz i Ikh Prilozheniya, No. 46, pp. 122–132, 1986.
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Khrabustovskii, V.I. Spectral analysis of periodic systems with degenerate weight (expansions in Bloch solutions). J Math Sci 48, 598–607 (1990). https://doi.org/10.1007/BF01095631
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DOI: https://doi.org/10.1007/BF01095631