%0 Journal Article %A Roman Węgrzyk %T On the extension of integrable solutions of a functional equation of n-th order %J Annales Polonici Mathematici %D 1983 %P 229-236 %V 41 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-41-3-229-236/ %R 10.4064/ap-41-3-229-236 %G en %F 10_4064_ap_41_3_229_236