MathSciDoc: An Archive for Mathematician ∫

@inproceedings{,
  title={Briefe von K. Weierstrass an L. Koenigsberger},
  author={},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203038095037323},
  booktitle={Acta Mathematica},
  volume={39},
  number={1},
  pages={226-239},
  year={1923},
}