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Blum, W.; Saller, H. Relativistic resonances as non-orthogonal states in Hilbert space. (English) Zbl 1030.81501 Eur. Phys. J., C 28, No. 2, 279-295 (2003). MSC: 81R05 81U99 35B34 PDFBibTeX XMLCite \textit{W. Blum} and \textit{H. Saller}, Eur. Phys. J. C, Part. Fields 28, No. 2, 279--295 (2003; Zbl 1030.81501) Full Text: DOI