%0 Journal Article %A Darlan GirĂ£o %T Rank gradient in co-final towers of certain Kleinian groups %J Groups, geometry, and dynamics %D 2014 %P 143-155 %V 8 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4171/ggd/220/ %R 10.4171/ggd/220 %F 10_4171_ggd_220