@article{01975349, title = {Sector estimates for Kleinian groups.}, journal = {Portugaliae Mathematica. Nova S\'erie}, volume = {58}, year = {2001}, pages = {461-471}, zbl = {1068.20053}, language = {en}, url = {http://dml.mathdoc.fr/item/01975349} }
Sharp, R. Sector estimates for Kleinian groups.. Portugaliae Mathematica. Nova Série, Tome 58 (2001) pp. 461-471. http://gdmltest.u-ga.fr/item/01975349/