%0 Journal Article %A Peter Teichner %A Michael H. Freedman %T 4-Manifold topology I: Subexponential groups. %J Inventiones mathematicae %D 1995 %P 509-530 %V 122 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1995__122_3_144330/ %F IM_1995__122_3_144330