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@inproceedings{ernst1882zur,
  title={Zur Theorie der Quadratischen Reste},
  author={Ernst Schering},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202926954218719},
  booktitle={Acta Mathematica},
  volume={1},
  number={1},
  pages={153-170},
  year={1882},
}