%0 Journal Article %A Karol Borsuk %T Concerning the shapes of n-dimensional spheres %J Fundamenta Mathematicae %D 1974 %P 197-202 %V 85 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-85-2-197-202/ %R 10.4064/fm-85-2-197-202 %G en %F 10_4064_fm_85_2_197_202