@incollection{AST_1977__41-42__135_0,
     author = {Zagier, Don},
     title = {Valeurs des fonctions z\^eta des corps quadratiques r\'eels aux entiers n\'egatifs},
     booktitle = {Journ\'ees arithm\'etiques de Caen},
     series = {Ast\'erisque},
     pages = {135--151},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {41-42},
     year = {1977},
     mrnumber = {441925},
     zbl = {0359.12012},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1977__41-42__135_0/}
}