@article{JSFS_1868__9__204_0, author = {JSFS}, title = {Vari\'et\'es}, journal = {Journal de la Soci\'et\'e de statistique de Paris}, pages = {204--220}, publisher = {Soci\'et\'e de statistique de Paris}, volume = {9}, year = {1868}, language = {fr}, url = {http://archive.numdam.org/item/JSFS_1868__9__204_0/} }