@article{10_4064_ba54_2_7,
     author = {Robert F. Brown},
     title = {Fixed {Points} of $n${-Valued} {Multimaps} of the {Circle}},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {153--162},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {2006},
     doi = {10.4064/ba54-2-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba54-2-7/}
}