@article{AIHPB_1971__7_4_283_0,
     author = {Bewley, Truman},
     title = {Extension of the {Birkhoff} and von {Neumann} ergodic theorems to semigroup actions},
     journal = {Annales de l'institut Henri Poincar\'e. Section B. Calcul des probabilit\'es et statistiques},
     pages = {283--291},
     publisher = {Gauthier-Villars},
     volume = {7},
     number = {4},
     year = {1971},
     mrnumber = {306444},
     zbl = {0226.28009},
     language = {en},
     url = {http://www.numdam.org/item/AIHPB_1971__7_4_283_0/}
}