@article{MZ_1993__212_4_174495,
     author = {Shoetsu Ogata},
     title = {Signature defects of {Hilbert-Picard} modular cusps.},
     journal = {Mathematische Zeitschrift},
     pages = {401--410},
     publisher = {mathdoc},
     volume = {212},
     number = {4},
     year = {1993},
     zbl = {0814.14002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1993__212_4_174495/}
}