%0 Journal Article
%A Luigi Paganoni
%A Daniela Rusconi
%T 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)).
%J Aequationes mathematicae
%D 1983
%P 138-162
%V 26
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1983__26_136996/
%F AM2_1983__26_136996