TY  - JOUR
AU  - Luigi Paganoni
AU  - Daniela Rusconi
TI  - A characterization of some classes of functions F of the form F(x, y) = g(...f(x) + ßf(y) + ...) or F(x, y) = ...(h(x) + k(y)).
JO  - Aequationes mathematicae
PY  - 1983
SP  - 138
EP  - 162
VL  - 26
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1983__26_136996/
ID  - AM2_1983__26_136996
ER  -