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Asymptotic behaviour of quasi-eigenvalues of the Laplace operator in the case of the outside of a circular disc. (English) Zbl 0444.35063
MSC:
35P20 Asymptotic distributions of eigenvalues in context of PDEs
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
78A45 Diffraction, scattering
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