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Herrn Helmut Wielandt zum 60. Geburtstag am 19. 12. 1970 gewidmet
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Ringel, C.M. Diagonalisierungspaare. I. Math Z 117, 249–266 (1970). https://doi.org/10.1007/BF01109846
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DOI: https://doi.org/10.1007/BF01109846