TY  - JOUR
AU  - Sergio Estrada
AU  - José L. Rodríguez
TI  - Envelopes and covers for groups
JO  - Groups, geometry, and dynamics
PY  - 2018
SP  - 107
EP  - 120
VL  - 12
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4171/ggd/440/
DO  - 10.4171/ggd/440
ID  - 10_4171_ggd_440
ER  -