MathSciDoc: An Archive for Mathematician ∫

@inproceedings{paul1927allgemeine,
  title={Allgemeine Theorie der Riemannschen Mannigfaltigkeiten},
  author={Paul Koebe},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203047978236403},
  booktitle={Acta Mathematica},
  volume={50},
  number={1},
  pages={27-157},
  year={1927},
}