@inproceedings{r.1892zur, title={Zur Theorie des Krummungsmaasses der Flächen}, author={R. von Lilienthal}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202954726114970}, booktitle={Acta Mathematica}, volume={16}, number={1}, pages={143-152}, year={1892}, }