@inproceedings{raymond2014reducibility,
title={Reducibility of invertible tuples to the principal component in commutative Banach algebras},
author={Raymond Mortini, and Rudolf Rupp},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203407007625818},
booktitle={Arkiv for Matematik},
pages={1-26},
year={2014},
}
Raymond Mortini, and Rudolf Rupp. Reducibility of invertible tuples to the principal component in commutative Banach algebras. 2014. In Arkiv for Matematik. pp.1-26. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203407007625818.