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@inproceedings{emile1926sur,
  title={Sur quelques équations intégrales singulières},
  author={Emile Picard},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203041847629351},
  booktitle={Acta Mathematica},
  volume={47},
  number={1},
  pages={1-6},
  year={1926},
}