@inproceedings{john1978quadratic,
title={Quadratic differentials and foliations},
author={John Hubbard, and Howard Masur},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203248674400256},
booktitle={Acta Mathematica},
volume={142},
number={1},
pages={221-274},
year={1978},
}