TY  - JOUR
AU  - Mark F. Hagen
AU  - Daniel T. Wise
TI  - Special groups with an elementary hierarchy are virtually free-by-$ℤ$
JO  - Groups, geometry, and dynamics
PY  - 2010
SP  - 597
EP  - 603
VL  - 4
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4171/ggd/96/
DO  - 10.4171/ggd/96
ID  - 10_4171_ggd_96
ER  -