@article{10_4064_sm_46_3_223_233,
     author = {Ryotaro Sato},
     title = {A general ratio ergodic theorem for {Abel} sums},
     journal = {Studia Mathematica},
     pages = {223--233},
     year = {1973},
     volume = {46},
     number = {3},
     doi = {10.4064/sm-46-3-223-233},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-46-3-223-233/}
}