@inproceedings{paul1916abhandlugnen,
title={Abhandlugnen zur Theorie der Konformen Abbildung},
author={Paul Koebe},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203031818072272},
booktitle={Acta Mathematica},
volume={40},
number={1},
pages={251-290},
year={1916},
}