@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}, }