MathSciDoc: An Archive for Mathematician ∫

@inproceedings{wolfgang1959theorie,
  title={Theorie der Normalflächen},
  author={Wolfgang Haken},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203156993841921},
  booktitle={Acta Mathematica},
  volume={105},
  number={3},
  pages={245-375},
  year={1959},
}