@article{10_4153_CMB_1970_036_4,
     author = {Schirmer, Helga},
     title = {Properties of the {Fixed} {Point} {Set} of {Contractive} {Multi-Functions}},
     journal = {Canadian mathematical bulletin},
     pages = {169--173},
     year = {1970},
     volume = {13},
     number = {2},
     doi = {10.4153/CMB-1970-036-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-036-4/}
}