@inproceedings{leo1900sur,
title={Sur les principes de la mécanique},
author={Leo Königsberger},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203005360264059},
booktitle={Acta Mathematica},
volume={23},
number={1},
pages={81-83},
year={1900},
}