@inproceedings{k.1895über, title={Über die Steinersche Fläche}, author={K. Th. Vahlen}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202959643049012}, booktitle={Acta Mathematica}, volume={19}, number={1}, pages={199-200}, year={1895}, }