@inproceedings{elvira1967groups,
title={Groups of order 1},
author={Elvira Strasser Rapaport},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203215445996061},
booktitle={Acta Mathematica},
volume={121},
number={1},
pages={127-150},
year={1967},
}