@inproceedings{dennis1984extending,
title={Extending holomorphic motions},
author={Dennis P. Sullivan, and William P. Thurston},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203307293729392},
booktitle={Acta Mathematica},
volume={157},
number={1},
pages={243-257},
year={1984},
}