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@article{10_4064_fm_115_1_9_26, author = {A. Suszycki}, title = {Retracts and homotopies for multi-maps}, journal = {Fundamenta Mathematicae}, pages = {9--26}, publisher = {mathdoc}, volume = {115}, number = {1}, year = {1983}, doi = {10.4064/fm-115-1-9-26}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-115-1-9-26/} }
A. Suszycki. Retracts and homotopies for multi-maps. Fundamenta Mathematicae, Tome 115 (1983) no. 1, pp. 9-26. doi : 10.4064/fm-115-1-9-26. http://geodesic.mathdoc.fr/articles/10.4064/fm-115-1-9-26/
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