@inproceedings{wilhelm1935über$n$-dimensionale, title={Über$n$-dimensionale Gittertransformationen}, author={Wilhelm Magnus}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203106474034544}, booktitle={Acta Mathematica}, volume={64}, number={1}, pages={353-367}, year={1935}, }