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Herrn Prof. Dr. Dr. h. c. Helmut Wielandt zum 80. Geburtstag gewidmet
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Langer, H., Schneider, A. On spectral properties of regular quasidefinite pencils F-λG. Results. Math. 19, 89–109 (1991). https://doi.org/10.1007/BF03322419
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DOI: https://doi.org/10.1007/BF03322419