@article{CMH_1948__21_138945,
     author = {J. Acz\'el},
     title = {\"Uber eine {Klasse} von {Funktionalgleichungen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {247--252},
     publisher = {mathdoc},
     volume = {21},
     year = {1948},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/CMH_1948__21_138945/}
}