@article{JSFS_1950__91__136_0,
     author = {Duon, G.},
     title = {Trois indices \'economiques},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {136--157},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {91},
     year = {1950},
     language = {fr},
     url = {http://www.numdam.org/item/JSFS_1950__91__136_0/}
}