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MR1610239 47F05 (35J10 35P05 81Q10)
Birman, M. Sh. The discrete spectrum in gaps of the perturbed periodic Schrödinger operator. II. Nonregular perturbations. (Russian) ; translated from Algebra i Analiz 9 (1997), no. 6, 62--89 St. Petersburg Math. J. 9 (1998), no. 6, 1073–1095
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