%0 Journal Article %A Lewis Bowen %T The ergodic theory of free group actions: entropy and the $f$-invariant %J Groups, geometry, and dynamics %D 2010 %P 419-432 %V 4 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4171/ggd/89/ %R 10.4171/ggd/89 %F 10_4171_ggd_89