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On the nonreal eigenvalues of elliptic differential operators with indefinite weights on Lipschitz domains
Abstract The nonreal spectrum of a second order elliptic differential operator with an indefinite weight function on a Lipschitz domain is investigated with the help of Krein space techniques and perturbation methods. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)