@article{1256046246,
author = {Becker, Maria E.},
title = {A ratio ergodic theorem for groups of measure-preserving transformations},
journal = {Illinois J. Math.},
volume = {27},
number = {4},
year = {1983},
pages = { 562-570},
language = {en},
url = {http://dml.mathdoc.fr/item/1256046246}
}
Becker, Maria E. A ratio ergodic theorem for groups of measure-preserving transformations. Illinois J. Math., Tome 27 (1983) no. 4, pp. 562-570. http://gdmltest.u-ga.fr/item/1256046246/