@inproceedings{w.1947the,
title={The Klein group in three dimensions},
author={W. L. Edge},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203123037011672},
booktitle={Acta Mathematica},
volume={79},
number={1},
pages={153-223},
year={1947},
}