@inproceedings{shuai2016minimization,
title={Minimization of Transformed $L_1$ Penalty: Closed Form Representation and Iterative Thresholding Algorithms},
author={Shuai Zhang, and Jack Xin},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160818152438772852246},
booktitle={Mathematics},
year={2016},
}

Shuai Zhang, and Jack Xin. Minimization of Transformed $L_1$ Penalty: Closed Form Representation and Iterative Thresholding Algorithms. 2016. In Mathematics. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160818152438772852246.