%0 Journal Article %A J. Matkowski %T A functional inequality characterizing convex functions, conjugacy and a generalization of Hölder's and Minkowski's inequalities. %J Aequationes mathematicae %D 1990 %P 168-180 %V 40 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1990__40_1_137371/ %F AM2_1990__40_1_137371