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This work was supported by the Deutsche Forschungsgemeinschaft, Sonderforschungsbereich 72 an der Universität Bonn.
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Fenske, C.C., Peitgen, HO. Repulsive fixed points of multivalued transformations and the fixed point index. Math. Ann. 218, 9–18 (1975). https://doi.org/10.1007/BF01350064
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DOI: https://doi.org/10.1007/BF01350064