TY - JOUR AU - Darlan GirĂ£o TI - Rank gradient in co-final towers of certain Kleinian groups JO - Groups, geometry, and dynamics PY - 2014 SP - 143 EP - 155 VL - 8 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4171/ggd/220/ DO - 10.4171/ggd/220 ID - 10_4171_ggd_220 ER -