@inproceedings{edgar1962nestinvertible,
title={Nestinvertible matrices},
author={Edgar Asplund},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203426630311977},
booktitle={Arkiv for Matematik},
volume={4},
number={4},
pages={319-322},
year={1962},
}