%0 Journal Article %A Janusz Matkowski %T A functional equation related to an equality of means problem %J Colloquium Mathematicum %D 2011 %P 289-298 %V 122 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm122-2-14/ %R 10.4064/cm122-2-14 %G en %F 10_4064_cm122_2_14