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Original Russian Text © D.I. Borisov, R.R. Gadyl’shin, 2007, published in Doklady Akademii Nauk, 2007, Vol. 413, No. 4, pp. 439–443.
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Borisov, D.I., Gadyl’shin, R.R. The spectrum of a periodic operator with a small localized perturbation. Dokl. Math. 75, 255–259 (2007). https://doi.org/10.1134/S1064562407020202
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DOI: https://doi.org/10.1134/S1064562407020202