@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/