@article{IM_1978__47_142576,
     author = {Stephen S. Kudla},
     title = {Intersection {Numbers} for {Quotients} of the {Complex} {2-Ball} and {Hilbert} {Modular} {Forms.}},
     journal = {Inventiones mathematicae},
     pages = {189--208},
     publisher = {mathdoc},
     volume = {47},
     year = {1978},
     zbl = {0399.10030},
     url = {http://geodesic.mathdoc.fr/item/IM_1978__47_142576/}
}