MathSciDoc: An Archive for Mathematician ∫

@inproceedings{m.1938die,
  title={Die Gruppe der Abbildungsklassen},
  author={M. Dehn},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203112187429590},
  booktitle={Acta Mathematica},
  volume={69},
  number={1},
  pages={135-206},
  year={1938},
}