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@inproceedings{otto1926über,
  title={Über die Arithmetischen Mittel Fourierscher Reihen},
  author={Otto Szász},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203045075474380},
  booktitle={Acta Mathematica},
  volume={48},
  number={3},
  pages={353-362},
  year={1926},
}