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@inproceedings{robert1929über,
  title={Über die Berechnung der Klasseninvarianten},
  author={Robert Fricke},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203050910457426},
  booktitle={Acta Mathematica},
  volume={52},
  number={1},
  pages={257-279},
  year={1929},
}