TY  - JOUR
AU  - François Gautero
TI  - A non-trivial example of a free-by-free group    with the Haagerup property
JO  - Groups, geometry, and dynamics
PY  - 2012
SP  - 677
EP  - 699
VL  - 6
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4171/ggd/170/
DO  - 10.4171/ggd/170
ID  - 10_4171_ggd_170
ER  -