%0 Journal Article %A Marvin Barsky %T Repeated convergence and fractional differences %J Annales Polonici Mathematici %D 1972 %P 221-237 %V 26 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-26-3-221-237/ %R 10.4064/ap-26-3-221-237 %G en %F 10_4064_ap_26_3_221_237