@inproceedings{trygve1964sur,
title={Sur une propriété des unités d'un corps algébrique},
author={Trygve Nagell},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203432114619025},
booktitle={Arkiv for Matematik},
volume={5},
number={3},
pages={343-356},
year={1964},
}