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@inproceedings{edvard1885sur,
  title={Sur un théorème concernant les fonctions elliptiques},
  author={Edvard Phragmen},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202937313844812},
  booktitle={Acta Mathematica},
  volume={7},
  number={1},
  pages={33-42},
  year={1885},
}