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@inproceedings{julius1899das,
  title={Das Reciprocitätsgesetz in der Theorie der quadratischen Reste},
  author={Julius König},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203004139705048},
  booktitle={Acta Mathematica},
  volume={22},
  number={1},
  pages={181-191},
  year={1899},
}