@inproceedings{amos2008prime,
title={Prime and almost prime integral points on principal homogeneous spaces},
author={Amos Nevo, and Peter Sarnak},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203355859120733},
booktitle={Acta Mathematica},
volume={205},
number={2},
pages={361-402},
year={2008},
}

Amos Nevo, and Peter Sarnak. Prime and almost prime integral points on principal homogeneous spaces. 2008. Vol. 205. In Acta Mathematica. pp.361-402. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203355859120733.