%0 Journal Article %A Imre Kocsis %T On the stability of a sum form functional equation of multiplicative type %J Annales mathematicae et informaticae %D 2001 %P 43-53 %V 28 %I mathdoc %U http://geodesic.mathdoc.fr/item/AMI_2001_28_a5/ %G en %F AMI_2001_28_a5