@article{AM2_1993__46_2-3_137543,
     author = {John A. Baker},
     title = {On a functional equation of {Acz\'el} and {Chung.}},
     journal = {Aequationes mathematicae},
     pages = {99--111},
     publisher = {mathdoc},
     volume = {46},
     number = {2-3},
     year = {1993},
     zbl = {0791.39008},
     url = {http://geodesic.mathdoc.fr/item/AM2_1993__46_2-3_137543/}
}