@inproceedings{yangyang2012an,
title={An alternating direction algorithm for matrix completion with nonnegative factors},
author={Yangyang Xu, Wotao Yin, Zaiwen Wen, and Yin Zhang},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191221112518167965701},
booktitle={Frontiers of Mathematics in China},
volume={7},
number={2},
pages={365-384},
year={2012},
}

Yangyang Xu, Wotao Yin, Zaiwen Wen, and Yin Zhang. An alternating direction algorithm for matrix completion with nonnegative factors. 2012. Vol. 7. In Frontiers of Mathematics in China. pp.365-384. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191221112518167965701.