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@article{PORMA_2001__58_4_51502, author = {Sharp, R.}, title = {Sector estimates for {Kleinian} groups.}, journal = {Portugaliae mathematica}, pages = {461--471}, publisher = {mathdoc}, volume = {58}, number = {4}, year = {2001}, zbl = {1068.20053}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_2001__58_4_51502/} }
Sharp, R. Sector estimates for Kleinian groups.. Portugaliae mathematica, Tome 58 (2001) no. 4, pp. 461-471. http://geodesic.mathdoc.fr/item/PORMA_2001__58_4_51502/