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Translated from Matematicheskie Zametki, Vol. 50, No. 4, pp. 88–95, October, 1991.
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Pastur, L.A., Tkachenko, V.A. Geometry of the spectrum of the one-dimensional Schrödinger equation with a periodic complex-valued potential. Mathematical Notes of the Academy of Sciences of the USSR 50, 1045–1050 (1991). https://doi.org/10.1007/BF01137736
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DOI: https://doi.org/10.1007/BF01137736