@article{GDZPPN002296780,
title = {Ergodic Theory and Virtual Groups.},
journal = {Mathematische Annalen},
volume = {163},
year = {1966},
pages = {187-207},
zbl = {0178.38802},
url = {http://dml.mathdoc.fr/item/GDZPPN002296780}
}
MACKEY, G.W. Ergodic Theory and Virtual Groups.. Mathematische Annalen, Tome 163 (1966) pp. 187-207. http://gdmltest.u-ga.fr/item/GDZPPN002296780/