@article{JSFS_1941__82__177_0,
     author = {Roy, Ren\'e},
     title = {Les divers concepts en mati\`ere d'indices},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {177--206},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {82},
     year = {1941},
     language = {fr},
     url = {http://www.numdam.org/item/JSFS_1941__82__177_0/}
}