@inproceedings{walter1995a,
title={A quantitative version of Picard's theorem},
author={Walter Bergweiler},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203548574317665},
booktitle={Arkiv for Matematik},
volume={34},
number={2},
pages={225-229},
year={1995},
}