@inproceedings{konrad1911divergenzcharactere,
title={Divergenzcharactere Gewisser Dirichlet'scher Reihen},
author={Konrad Knopp},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203023656642210},
booktitle={Acta Mathematica},
volume={34},
number={1},
pages={165-204},
year={1911},
}