@inproceedings{gérard1998lemme,
title={Lemme de Schwarz réel et applications géométriques},
author={Gérard Besson, Gilles Courtois, and Sylvestre Gallot},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203334588525585},
booktitle={Acta Mathematica},
volume={183},
number={2},
pages={145-169},
year={1998},
}
Gérard Besson, Gilles Courtois, and Sylvestre Gallot. Lemme de Schwarz réel et applications géométriques. 1998. Vol. 183. In Acta Mathematica. pp.145-169. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203334588525585.