@inproceedings{r.1887zur, title={Zur Theorie der Krummen Oberflächen}, author={R. Lipschitz}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202941695702851}, booktitle={Acta Mathematica}, volume={10}, number={1}, pages={131-136}, year={1887}, }