@article{10_4064_sm_97_2_71_84,
     author = {Ryotaro Sato},
     title = {On pointwise ergodic theorems for positive operators},
     journal = {Studia Mathematica},
     pages = {71--84},
     year = {1990},
     volume = {97},
     number = {2},
     doi = {10.4064/sm-97-2-71-84},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-97-2-71-84/}
}