MathSciDoc: An Archive for Mathematician ∫

@inproceedings{elvira1958on,
  title={On free groups and their automorphisms},
  author={Elvira Strasser Rapaport},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203150276077874},
  booktitle={Acta Mathematica},
  volume={99},
  number={1},
  pages={138-163},
  year={1958},
}