@article{JSFS_1959__100__35_0,
     author = {Vincent, L. A.},
     title = {D\'efinition et mesure de la productivit\'e},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {35--46},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {100},
     year = {1959},
     language = {fr},
     url = {http://www.numdam.org/item/JSFS_1959__100__35_0/}
}