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Translated from Matematicheskie Zametki, Vol. 1, No. 5, pp. 595–604, May, 1967.
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Levitan, B.M., Ramm, A.G. Asymptotic behavior of eigenvalues when the potential depends on a parameter. Mathematical Notes of the Academy of Sciences of the USSR 1, 393–399 (1967). https://doi.org/10.1007/BF01094079
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DOI: https://doi.org/10.1007/BF01094079