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@article{10_4064_fm_78_2_169_176, author = {Helga Schirmer}, title = {Homotopy for small multifunctions}, journal = {Fundamenta Mathematicae}, pages = {169--176}, publisher = {mathdoc}, volume = {78}, number = {2}, year = {1973}, doi = {10.4064/fm-78-2-169-176}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-78-2-169-176/} }
Helga Schirmer. Homotopy for small multifunctions. Fundamenta Mathematicae, Tome 78 (1973) no. 2, pp. 169-176. doi : 10.4064/fm-78-2-169-176. http://geodesic.mathdoc.fr/articles/10.4064/fm-78-2-169-176/
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