@incollection{MSMF_1977__49-50__109_0,
     author = {Gras, Marie-Nicole},
     title = {Calcul de nombres de classes par d\'evissage des unit\'es cyclotomiques},
     booktitle = {Utilisation des calculateurs en math\'ematiques pures (Limoges, 1975)},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     pages = {109--112},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {49-50},
     year = {1977},
     doi = {10.24033/msmf.218},
     mrnumber = {58 #587},
     zbl = {0365.12005},
     url = {http://archive.numdam.org/articles/10.24033/msmf.218/}
}