@inproceedings{jürgen1992on,
title={On the order of prime powers dividing (_{n}^{2n})},
author={Jürgen W. Sander},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203324063776511},
booktitle={Acta Mathematica},
volume={174},
number={1},
pages={85-118},
year={1992},
}