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@article{MAN_1991__289_4_164779, author = {Rainer Wittmann}, title = {Hopfs ergodic theorem for nonlinear operators.}, journal = {Mathematische Annalen}, pages = {239--254}, publisher = {mathdoc}, volume = {289}, number = {4}, year = {1991}, zbl = {0703.47042}, url = {http://geodesic.mathdoc.fr/item/MAN_1991__289_4_164779/} }
Rainer Wittmann. Hopfs ergodic theorem for nonlinear operators.. Mathematische Annalen, Tome 289 (1991) no. 4, pp. 239-254. http://geodesic.mathdoc.fr/item/MAN_1991__289_4_164779/