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This work was supported by the Russian Foundation for Basic Research, grant no. 20-01-00451 A.
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Translated from Matematicheskie Zametki, 2023, Vol. 113, pp. 785–790 https://doi.org/10.4213/mzm13932.
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Fedotov, A.A. Close Turning Points and the Harper Operator. Math Notes 113, 741–746 (2023). https://doi.org/10.1134/S0001434623050152
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DOI: https://doi.org/10.1134/S0001434623050152