%0 Journal Article %A Ryotaro Sato %T A general ratio ergodic theorem for Abel sums %J Studia Mathematica %D 1973 %P 223-233 %V 46 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-46-3-223-233/ %R 10.4064/sm-46-3-223-233 %G en %F 10_4064_sm_46_3_223_233