@inproceedings{andrew1984diophantine,
title={Diophantine approximation on hyperbolic Riemann surfaces},
author={Andrew Haas},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203305623480381},
booktitle={Acta Mathematica},
volume={156},
number={1},
pages={33-82},
year={1984},
}