%0 Journal Article %A László Losonczi %T A structure theorem for sum form functional equations. %J Aequationes mathematicae %D 1997 %P 141-154 %V 53 %N 1-2 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1997__53_1-2_137682/ %F AM2_1997__53_1-2_137682