%0 Journal Article %A Alan Durfee %A Louis Kauffman %T Periodicity of Branched Cyclic Covers. %J Mathematische Annalen %D 1975 %P 157-174 %V 218 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1975__218_162790/ %F MAN_1975__218_162790