@incollection{MSMF_1977__49-50__101_0,
     author = {Gras, Georges},
     title = {Approche num\'erique de la structure du groupe des classes des extensions ab\'eliennes de $\mathbb {Q}$},
     booktitle = {Utilisation des calculateurs en math\'ematiques pures (Limoges, 1975)},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     pages = {101--107},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {49-50},
     year = {1977},
     doi = {10.24033/msmf.217},
     mrnumber = {58 #588},
     zbl = {0365.12006},
     url = {http://archive.numdam.org/articles/10.24033/msmf.217/}
}