%0 Journal Article %A Steven Boyer %T Realization of simply-connected 4-manifolds with a given boundary. %J Commentarii mathematici Helvetici %D 1993 %P 20-47 %V 68 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140292/ %F CMH_1993__68_2_140292