%0 Journal Article %A Leo Jonker %A David Rand %T Bifurcations in One Dimension. II. A Versal Model for Bifurcations. %J Inventiones mathematicae %D 1981 %P 1-16 %V 63 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1981__63_142787/ %F IM_1981__63_142787