@incollection{SB_1983-1984__26__309_0,
     author = {Oesterl\'e, Joseph},
     title = {Nombres de classes des corps quadratiques imaginaires},
     booktitle = {S\'eminaire Bourbaki : volume 1983/84, expos\'es 615-632},
     series = {Ast\'erisque},
     note = {talk:631},
     pages = {309--323},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {121-122},
     year = {1985},
     mrnumber = {768967},
     zbl = {0551.12003},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1983-1984__26__309_0/}
}