%0 Journal Article %A Daniel S. Freed %T Z/k-Manifolds and families of Dirac operators. %J Inventiones mathematicae %D 1988 %P 243-254 %V 92 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1988__92_1_143567/ %F IM_1988__92_1_143567