@incollection{AST_1975__24-25__81_0,
     author = {Zagier, Don},
     title = {Nombres de classes et fractions continues},
     booktitle = {Journ\'ees arithm\'etiques de Bordeaux},
     series = {Ast\'erisque},
     pages = {81--97},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {24-25},
     year = {1975},
     mrnumber = {374093},
     zbl = {0309.12002},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1975__24-25__81_0/}
}