@inproceedings{g.1902über,
title={Über Gruppen der Ordnung$p$^{$a$}$q$^{3}},
author={G. Frobenius},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203010496813101},
booktitle={Acta Mathematica},
volume={26},
number={1},
pages={189-198},
year={1902},
}