%0 Journal Article
%A Marek Kuczma
%T On a theorem of B. Barna. (Short Communication).
%J Aequationes mathematicae
%D 1980
%P 115-115
%V 20
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1980__20_182387/
%F AM2_1980__20_182387