%0 Journal Article %A J. PFANZAGL %T On the Functional Equation ... (x) + ... (y) = v(T(x, y)) %J Aequationes mathematicae %D 1971 %P 202-205 %V 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1971__6_136189/ %F AM2_1971__6_136189