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@inproceedings{vito1899sur,
  title={Sur la théorie des variations des latitudes},
  author={Vito Volterra},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203004436264051},
  booktitle={Acta Mathematica},
  volume={22},
  number={1},
  pages={201-357},
  year={1899},
}