@inproceedings{l.1962the,
title={The diophantine equation 2^{$n$}=$x$^{2}+7},
author={L. J. Mordell},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203427891136989},
booktitle={Arkiv for Matematik},
volume={4},
number={5},
pages={455-460},
year={1962},
}