TY  - JOUR
AU  - Russell Lyons
AU  - Mikaël Pichot
AU  - Stéphane Vassout
TI  - Uniform non-amenability, cost, and the first $\ell^2$-Betti number
JO  - Groups, geometry, and dynamics
PY  - 2008
SP  - 595
EP  - 617
VL  - 2
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4171/ggd/49/
DO  - 10.4171/ggd/49
ID  - 10_4171_ggd_49
ER  -