@inproceedings{trygve1958sur, title={Sur une classe d’équations exponentielles}, author={Trygve Nagell}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203423907601954}, booktitle={Arkiv for Matematik}, volume={3}, number={6}, pages={569-582}, year={1958}, }