Positive definite binary quadratic forms and Hilbert modular surfaces (joint work with D. Zagier)
Journées arithmétiques de Caen, Astérisque no. 41-42  (1977), p. 229
@incollection{AST_1977__41-42__229_0,
     author = {Hirzebruch, Friedrich},
     title = {Positive definite binary quadratic forms and Hilbert modular surfaces (joint work with D. Zagier)},
     booktitle = {Journ\'ees arithm\'etiques de Caen},
     author = {Collectif},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {41-42},
     year = {1977},
     pages = {229-229},
     zbl = {0345.14008},
     language = {en},
     url = {http://www.numdam.org/item/AST_1977__41-42__229_0}
}
Hirzebruch, Friedrich. Positive definite binary quadratic forms and Hilbert modular surfaces (joint work with D. Zagier), in Journées arithmétiques de Caen, Astérisque, no. 41-42 (1977), p. 229. http://www.numdam.org/item/AST_1977__41-42__229_0/