@article{MAN_1975__218_162781,
     author = {Christian C. Fenske and Heinz-Otto. Peitgen},
     title = {Repulsive {Fixed} {Points} of {Multivalued} {Transformations} and the {Fixed} {Point} {Index.}},
     journal = {Mathematische Annalen},
     pages = {9--18},
     publisher = {mathdoc},
     volume = {218},
     year = {1975},
     zbl = {0297.55005},
     url = {http://geodesic.mathdoc.fr/item/MAN_1975__218_162781/}
}