MathSciDoc: An Archive for Mathematician ∫

@inproceedings{h.1962the,
  title={The fundamental group of a surface, and a theorem of Schreier},
  author={H. B. Griffiths},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203201884779958},
  booktitle={Acta Mathematica},
  volume={110},
  number={1},
  pages={1-17},
  year={1962},
}