@inproceedings{shaohuatwo,
title={Two unconstrained optimization approaches for the Euclidean -centrum location problem},
author={Shaohua Pan, and Jein-Shan Chen},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020225238493707463},
booktitle={Applied mathematics and computation},
volume={189},
number={2},
pages={1368-1383},
}

Shaohua Pan, and Jein-Shan Chen. Two unconstrained optimization approaches for the Euclidean -centrum location problem. Vol. 189. In Applied mathematics and computation. pp.1368-1383. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020225238493707463.