@inproceedings{mansoor1955cauchy's,
title={Cauchy's theorem and its converse},
author={Mansoor Ahmad},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203141916415810},
booktitle={Acta Mathematica},
volume={93},
number={1},
pages={15-25},
year={1955},
}