@article{GDZPPN002335026, title = {Hopfs ergodic theorem for nonlinear operators.}, journal = {Mathematische Annalen}, volume = {291}, year = {1991}, pages = {239-254}, zbl = {0703.47042}, url = {http://dml.mathdoc.fr/item/GDZPPN002335026} }
Wittmann, Rainer. Hopfs ergodic theorem for nonlinear operators.. Mathematische Annalen, Tome 291 (1991) pp. 239-254. http://gdmltest.u-ga.fr/item/GDZPPN002335026/