@article{ASENS_1916_3_33__363_0,
     author = {Picard, \'Emile},
     title = {Sur certains groupes discontinus correspondant aux formes quadratiques ternaires},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {363--371},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 33},
     year = {1916},
     doi = {10.24033/asens.696},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.696/}
}