Literature cited
N. E. Firsova, “The Riemann surface of a quasiimpulse, and scattering theory for a perturbed Hill operator,” J. Sov. Math.,11, No. 3 (1979).
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Translated from Matematicheskie Zametki, Vol. 36, No. 5, pp. 711–724, November, 1984.
The author expresses his deep gratitude to M. Sh. Birman for guidance.
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Firsova, N.E. Resonances of a hill operator, perturbed by an exponentially decreasing additive potential. Mathematical Notes of the Academy of Sciences of the USSR 36, 854–861 (1984). https://doi.org/10.1007/BF01139933
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DOI: https://doi.org/10.1007/BF01139933