@inproceedings{g.1988on,
title={On discrete Möbius groups in all dimensions: A generalization of Jørgensen's inequality},
author={G. J. Martin},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203313339814437},
booktitle={Acta Mathematica},
volume={163},
number={1},
pages={253-289},
year={1988},
}
G. J. Martin. On discrete Möbius groups in all dimensions: A generalization of Jørgensen's inequality. 1988. Vol. 163. In Acta Mathematica. pp.253-289. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203313339814437.