@article{BSMF_1979__107__305_0,
     author = {Gillard, Roland and Robert, Gilles},
     title = {Groupes d'unit\'es elliptiques},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {305--317},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {107},
     year = {1979},
     doi = {10.24033/bsmf.1899},
     mrnumber = {81c:12009},
     zbl = {0434.12003},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1899/}
}