@inproceedings{trygve1970quelques, title={Quelques problèmes relatifs aux unités algébriques}, author={Trygve Nagell}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203444074496127}, booktitle={Arkiv for Matematik}, volume={8}, number={2}, pages={115-127}, year={1970}, }