@article{PMB_1975____A1_0,
     author = {Gras, Georges and Gras, Marie-Nicole},
     title = {Calcul du nombre de classes et des unit\'es des extensions ab\'eliennes r\'eelles de $\protect \mathbb{Q}$},
     journal = {Publications math\'ematiques de la Facult\'e des sciences de Besan\c{c}on. Th\'eorie des nombres},
     eid = {1},
     pages = {1--50},
     publisher = {Universit\'e de Besan\c{c}on},
     year = {1975},
     doi = {10.5802/pmb.a-1},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/pmb.a-1/}
}