%0 Journal Article %A Kenneth Kellum %T On a question of Borsuk concerning non-continuous retracts I %J Fundamenta Mathematicae %D 1975 %P 89-92 %V 87 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-87-2-89-92/ %R 10.4064/fm-87-2-89-92 %G en %F 10_4064_fm_87_2_89_92