@article{JSFS_1880__21__75_0, author = {JSFS}, title = {Vari\'et\'es}, journal = {Journal de la Soci\'et\'e de statistique de Paris}, pages = {75--81}, publisher = {Soci\'et\'e de statistique de Paris}, volume = {21}, year = {1880}, language = {fr}, url = {http://archive.numdam.org/item/JSFS_1880__21__75_0/} }