@inproceedings{c.1891nachschrift,
title={Nachschrift},
author={C. R.},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202953564157960},
booktitle={Acta Mathematica},
volume={15},
number={1},
pages={247-247},
year={1891},
}