%0 Journal Article
%A François Gautero
%T A non-trivial example of a free-by-free group    with the Haagerup property
%J Groups, geometry, and dynamics
%D 2012
%P 677-699
%V 6
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4171/ggd/170/
%R 10.4171/ggd/170
%F 10_4171_ggd_170