%0 Journal Article %A Larry Siebenmann %T Chapman's Classification of Shapes. A Proof Using Collapsing. %J Manuscripta mathematica %D 1975 %P 373-384 %V 16 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1975__16_154350/ %F MM2_1975__16_154350