%0 Journal Article %A M. Kwapisz %A J. Turo %T Existence and uniqueness of solutions of non-linear functional equations of r-th order %J Annales Polonici Mathematici %D 1975 %P 145-157 %V 31 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-31-2-145-157/ %R 10.4064/ap-31-2-145-157 %G en %F 10_4064_ap_31_2_145_157