MathSciNet bibliographic data MR1433122 35P20 (35J10 47F05 47N50 81Q10) Levendorskiĭ, S. Z. Asymptotic formulae with remainder estimates for eigenvalue branches of the Schrödinger operator $H-\lambda W$$H-\lambda W$ in a gap of $H$$H$. Trans. Amer. Math. Soc. 351 (1999), no. 3, 857–899. Article

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