@inproceedings{richard1999degenerating,
title={Degenerating the complex hyperbolic ideal triangle groups},
author={Richard Evan Schwartz},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203337870491606},
booktitle={Acta Mathematica},
volume={186},
number={1},
pages={105-154},
year={1999},
}
Richard Evan Schwartz. Degenerating the complex hyperbolic ideal triangle groups. 1999. Vol. 186. In Acta Mathematica. pp.105-154. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203337870491606.