@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}, }