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Publication:3363560
zbMATH Open0741.35046MaRDI QIDQ3363560
Publication date: 1991
Title of this publication is not available (Why is that?)
General topics in linear spectral theory for PDEs (35P05) Perturbation theory of linear operators (47A55) Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation (35J05) Perturbations in context of PDEs (35B20)
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