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Additional information
Institute of Metal Physics, Ural Scientific Center of the USSR Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 74, No. 1, pp. 94–102, January, 1988.
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Dyakin, V.V., Petrukhnovskii, S.I. On discreteness of the spectrum of some operator sheaves associated with a periodic Schrödinger equation. Theor Math Phys 74, 66–72 (1988). https://doi.org/10.1007/BF01018212
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DOI: https://doi.org/10.1007/BF01018212