%0 Journal Article %A A. Suszycki %T Retracts and homotopies for multi-maps %J Fundamenta Mathematicae %D 1983 %P 9-26 %V 115 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-115-1-9-26/ %R 10.4064/fm-115-1-9-26 %G en %F 10_4064_fm_115_1_9_26