%0 Journal Article %A Maria Rita Casali %T A combinatorial characterization of 4-dimensional handlebodies. %J Forum mathematicum %D 1992 %P 123-134 %V 4 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/FORUM_1992__4_6_141666/ %F FORUM_1992__4_6_141666