%0 Journal Article %A J.M. Montesinos %A H.M. Hilden %A M.T. Lozano %T On universal groups and three-manifolds. %J Inventiones mathematicae %D 1987 %P 441-456 %V 87 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1987__87_143429/ %F IM_1987__87_143429