@inproceedings{lars1964real,
title={Real banach algebras},
author={Lars Ingelstam},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203431133090016},
booktitle={Arkiv for Matematik},
volume={5},
number={3},
pages={239-270},
year={1964},
}