@inproceedings{h.1897la,
title={La méthode de Neumann et le problème de Dirichlet},
author={H. Poincaré},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203000597195020},
booktitle={Acta Mathematica},
volume={20},
number={1},
pages={59-142},
year={1897},
}