Ramm, Alexander G.2013-05-082013-05-081998-06-04http://hdl.handle.net/2097/15762Variational principles for calculating the complex poles of Green's function are given. Convergence of the numerical procedure is proved.en-USThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).Variational principlesGreen's functionArticle (publisher version)