@article{AM2_1974__11_136431,
     author = {C.T. Ng and J. Acz\'el and B. forte},
     title = {On a {Triangular} {Functional} {Equation} and {Some} {Applications,} in {Particular} to the {Generalized} {Theory} of {Information.}},
     journal = {Aequationes mathematicae},
     pages = {11--30},
     publisher = {mathdoc},
     volume = {11},
     year = {1974},
     zbl = {0292.39003},
     url = {http://geodesic.mathdoc.fr/item/AM2_1974__11_136431/}
}