@article{JSFS_1881__22__163_0,
     author = {JSFS},
     title = {Vari\'et\'es},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {163--168},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {22},
     year = {1881},
     language = {fr},
     url = {http://archive.numdam.org/item/JSFS_1881__22__163_0/}
}