%0 Journal Article %A Helga Schirmer %T An index and a Nielsen number for n-valued multifunctions %J Fundamenta Mathematicae %D 1984 %P 207-219 %V 124 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-124-3-207-219/ %R 10.4064/fm-124-3-207-219 %G en %F 10_4064_fm_124_3_207_219