TY  - JOUR
AU  - Lewis Bowen
TI  - The ergodic theory of free group actions:  entropy and the $f$-invariant
JO  - Groups, geometry, and dynamics
PY  - 2010
SP  - 419
EP  - 432
VL  - 4
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4171/ggd/89/
DO  - 10.4171/ggd/89
ID  - 10_4171_ggd_89
ER  -