@inproceedings{cameron2012on,
title={On divisors of Lucas and Lehmer numbers},
author={Cameron L. Stewart},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203401980570781},
booktitle={Acta Mathematica},
volume={211},
number={2},
pages={291-314},
year={2012},
}