@inproceedings{andrzej1962the,
title={The intrinsic divisors of Lehmer numbers in the case of negative discriminant},
author={Andrzej Schinzel},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203427644674987},
booktitle={Arkiv for Matematik},
volume={4},
number={5},
pages={413-416},
year={1962},
}
Andrzej Schinzel. The intrinsic divisors of Lehmer numbers in the case of negative discriminant. 1962. Vol. 4. In Arkiv for Matematik. pp.413-416. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203427644674987.