@incollection{AST_1976__32-33__151_0,
     author = {Hirzebruch, Friedrich},
     title = {Hilbert modular surfaces and class numbers},
     booktitle = {Colloque analyse et topologie},
     series = {Ast\'erisque},
     pages = {151--164},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {32-33},
     year = {1976},
     mrnumber = {447255},
     zbl = {0334.14017},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1976__32-33__151_0/}
}