@article{10_4064_sm_87_1_47_52,
     author = {Ryotaro Sato},
     title = {On a ratio ergodic theorem},
     journal = {Studia Mathematica},
     pages = {47--52},
     publisher = {mathdoc},
     volume = {87},
     number = {1},
     year = {1987},
     doi = {10.4064/sm-87-1-47-52},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-87-1-47-52/}
}