@inproceedings{léon1895mémoire,
title={Mémoire sur le pendule de longueur variable},
author={Léon Lecornu},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202959739497013},
booktitle={Acta Mathematica},
volume={19},
number={1},
pages={201-249},
year={1895},
}