Geodesic
On the spectrum of a periodic operator with a small localized perturbation
Izvestiya. Mathematics, Tome 72 (2008) no. 4, pp. 659-688 Cet article a éte moissonné depuis la source Math-Net.Ru

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The paper deals with the spectrum of a periodic self-adjoint differential operator on the real axis perturbed by a small localized non-self-adjoint operator. We show that the continuous spectrum does not depend on the perturbation, the residual spectrum is empty, and the point spectrum has no finite accumulation points. We study the problem of the existence of eigenvalues embedded in the continuous spectrum, obtain necessary and sufficient conditions for the existence of eigenvalues, construct asymptotic expansions of the eigenvalues and corresponding eigenfunctions and consider some examples. 
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D. I. Borisov; R. R. Gadyl'shin. On the spectrum of a periodic operator with a small localized perturbation. Izvestiya. Mathematics, Tome 72 (2008) no. 4, pp. 659-688. http://geodesic.mathdoc.fr/item/IM2_2008_72_4_a2/

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