@article{JSFS_1953__94__231_0,
     author = {Roy, Ren\'e},
     title = {Remarques sur la notion de productivit\'e},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {231--243},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {94},
     year = {1953},
     language = {fr},
     url = {http://archive.numdam.org/item/JSFS_1953__94__231_0/}
}