%0 Journal Article %A G.C. Hamrick %A David C. Royster %T Flat Riemannian Manifolds are Boundaries. %J Inventiones mathematicae %D 1982 %P 405-414 %V 66 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1982__66_142890/ %F IM_1982__66_142890