%0 Journal Article %A Z. Kominek %A J. Matkowski %T On the existence of a convex solution of the functional equation φ(x) = h(x,φ[f(x)]) %J Annales Polonici Mathematici %D 1974 %P 1-4 %V 30 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-30-1-1-4/ %R 10.4064/ap-30-1-1-4 %G en %F 10_4064_ap_30_1_1_4