MathSciDoc: An Archive for Mathematician ∫

@inproceedings{helmut1956ähnlichkeitsanalyse,
  title={Ähnlichkeitsanalyse Von Gruppenrelationen},
  author={Helmut Schiek},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203145877155839},
  booktitle={Acta Mathematica},
  volume={96},
  number={1},
  pages={157-252},
  year={1956},
}