@article{PIM_1948_S_S_II_02_a20,
     author = {Jean Acz\'el},
     title = {Sur {Une} {\'Equation} {Fonctionnelle}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {257 },
     publisher = {mathdoc},
     volume = {_S_S_II},
     number = {02},
     year = {1948},
     url = {http://geodesic.mathdoc.fr/item/PIM_1948_S_S_II_02_a20/}
}