%0 Journal Article %A Wilfried Schmid %T Variation of Hodge Structure: The Singularities of the Period Mapping. %J Inventiones mathematicae %D 1973 %P 211-320 %V 22 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1973__22_142246/ %F IM_1973__22_142246