%0 Journal Article %A László Székelyhidi %T On a linear functional equation. %J Aequationes mathematicae %D 1989 %P 113-122 %V 38 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137320/ %F AM2_1989__38_1_137320