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Additional information
Naval Electronics College. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 62, No. 2, pp. 196–209, February, 1985.
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Firsova, N.E. Levinson formula for perturbed Hill operator. Theor Math Phys 62, 130–140 (1985). https://doi.org/10.1007/BF01033522
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DOI: https://doi.org/10.1007/BF01033522