@article{MAN_1992__292_2_164898,
     author = {H.G. Grundmann},
     title = {Defects of cusp singularities and the classification of {Hilbert} modular threefolds.},
     journal = {Mathematische Annalen},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {292},
     number = {2},
     year = {1992},
     url = {http://geodesic.mathdoc.fr/item/MAN_1992__292_2_164898/}
}