@inproceedings{ivar1902sur,
title={Sur les racines d'une équation fondamentale},
author={Ivar Bendixson},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203009413385091},
booktitle={Acta Mathematica},
volume={25},
number={1},
pages={359-365},
year={1902},
}