%0 Journal Article
%A Gy. Petruska
%T On a functional equation with retarded mean.
%J Aequationes mathematicae
%D 1989
%P 66-72
%V 38
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137316/
%F AM2_1989__38_1_137316