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Die Asymptotik von Quasieigenwerten des Laplaceoperators im Äußeren einer Kreisscheibe. (Russian) Zbl 0421.35068

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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