@article{10_4064_fm_124_3_207_219,
     author = {Helga Schirmer},
     title = {An index and a {Nielsen} number for n-valued multifunctions},
     journal = {Fundamenta Mathematicae},
     pages = {207--219},
     publisher = {mathdoc},
     volume = {124},
     number = {3},
     year = {1984},
     doi = {10.4064/fm-124-3-207-219},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-124-3-207-219/}
}