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@inproceedings{hjalmar1883ueber,
  title={Ueber die Transcendente Function$Q(x)=Д(x)−P(x)$},
  author={Hjalmar Mellin},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202928817750735},
  booktitle={Acta Mathematica},
  volume={2},
  number={1},
  pages={231-232},
  year={1883},
}