@inproceedings{benoıt2011half-space,
title={Half-space theorems for minimal surfaces in $Nil_3$ and $Sol_3$},
author={Benoıt Daniel,, William H. Meeks,, and Harold Rosenberg},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160912074158885189877},
booktitle={Journal of Differential Geometry},
volume={88},
number={1},
pages={41-59},
year={2011},
}

Benoıt Daniel,, William H. Meeks,, and Harold Rosenberg. Half-space theorems for minimal surfaces in $Nil_3$ and $Sol_3$. 2011. Vol. 88. In Journal of Differential Geometry. pp.41-59. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160912074158885189877.