@article{AM2_1981__23_136907,
     author = {P. Fischer and J.P. Mokansi},
     title = {A class of symmetric biadditive functionals.},
     journal = {Aequationes mathematicae},
     pages = {169--174},
     year = {1981},
     volume = {23},
     zbl = {0515.15008},
     url = {http://geodesic.mathdoc.fr/item/AM2_1981__23_136907/}
}