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Discrete spectrum of the periodic Schrödinger operator perturbed by a decaying potential. (English. Russian original) Zbl 0866.35087
St. Petersbg. Math. J. 8, No. 1, 1-14 (1997); translation from Algebra Anal. 8, No. 1, 3-20 (1996).
See the review in Zbl 0853.35082.

MSC:
35P20 Asymptotic distributions of eigenvalues in context of PDEs
35J10 Schrödinger operator, Schrödinger equation
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