Grigor’eva, N. S. Die Asymptotik von Quasieigenwerten des Laplaceoperators im Äußeren einer Kreisscheibe. (Russian) Zbl 0421.35068 Zh. Vychisl. Mat. Mat. Fiz. 19, 1217-1227 (1979). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Review MSC: 35P20 Asymptotic distributions of eigenvalues in context of PDEs 35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation 78A45 Diffraction, scattering Keywords:eigenvalues; Laplacian; asymptotic behaviour; diffraction theory; geometrical interpretation PDF BibTeX XML Cite \textit{N. S. Grigor'eva}, Zh. Vychisl. Mat. Mat. Fiz. 19, 1217--1227 (1979; Zbl 0421.35068)