@article{JSFS_1866__7__116_0,
     author = {JSFS},
     title = {Vari\'et\'es},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {116--128},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {7},
     year = {1866},
     language = {fr},
     url = {http://www.numdam.org/item/JSFS_1866__7__116_0/}
}