%0 Journal Article %A H.G. Grundmann %T Defects of cusp singularities and the classification of Hilbert modular threefolds. %J Mathematische Annalen %D 1992 %P 1-12 %V 292 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1992__292_2_164898/ %F MAN_1992__292_2_164898