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19982006
most citedAsymptotics of Eigenvalues and Eigenfunctions for the Laplace Operator in a Domain with Oscillating Boundary. Multiple Eigenvalue Case

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math.SP2006★ 1 cited

On spectrum of a periodic operator with a small localized perturbation

D. Borisov, R. Gadyl'shin

We study the spectrum of a periodic self-adjoint operator on the axis perturbed by a small localized nonself-adjoint operator. It is shown that the continuous spectrum is independe…