MathSciDoc: An Archive for Mathematician ∫

@inproceedings{i.1906lettre,
  title={Lettre},
  author={I. Richard},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203019042363175},
  booktitle={Acta Mathematica},
  volume={30},
  number={1},
  pages={295-296},
  year={1906},
}