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@inproceedings{gerhard1923über,
  title={Über Bolzanos Nichtdifferenzierbare Stetige Funktion},
  author={Gerhard Kowalewski},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203039121926332},
  booktitle={Acta Mathematica},
  volume={44},
  number={1},
  pages={315-319},
  year={1923},
}