Discrete spectrum of the periodic elliptic operator with a differential perturbation
Journées équations aux dérivées partielles (1994), article no. 14, 4 p. 
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     author = {Mikhail Sh. Birman},
     title = {Discrete spectrum of the periodic elliptic operator with a differential perturbation},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {14},
     pages = {1--4},
     publisher = {\'Ecole polytechnique},
     year = {1994},
     mrnumber = {1298685},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1994____A14_0/}
}
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Mikhail Sh. Birman. Discrete spectrum of the periodic elliptic operator with a differential perturbation. Journées équations aux dérivées partielles (1994), article  no. 14, 4 p. https://proceedings.centre-mersenne.org/item/JEDP_1994____A14_0/

1. S. Alama, M. Avellaneda, P.A. Deift, R. Hempel, On the existence of eigenvalues of a divergence form operator A + λB in a gap of σ(A), Asymptotic Analysis 8 (4) (1994), 311-344. | MR | Zbl

2. M.Sh. Birman, Discrete spectrum of the periodic Schrödinger operator for non-negative perturbations, Operator Theory: Advances and Applications, vol. 70, Birkhäuser, Basel, 1994. | MR | Zbl