@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}, }