@inproceedings{s.1916sur,
title={Sur la série de lambert et son application à la théorie des nombres},
author={S. Wigert},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203033202028284},
booktitle={Acta Mathematica},
volume={41},
number={1},
pages={197-218},
year={1916},
}