@inproceedings{lars1956a,
title={A theorem concerning the least quadratic residue and non-residue},
author={Lars Fjellstedt},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203420879165925},
booktitle={Arkiv for Matematik},
volume={3},
number={3},
pages={287-291},
year={1956},
}
Lars Fjellstedt. A theorem concerning the least quadratic residue and non-residue. 1956. Vol. 3. In Arkiv for Matematik. pp.287-291. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203420879165925.