@inproceedings{gerhard1996definition,
title={Definition of center of mass for isolated physical systems and unique foliations by stable spheres with constant mean curvature},
author={Gerhard Huisken, and Shing-Tung Yau},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203558515927055},
booktitle={Inventiones mathematicae},
volume={124},
pages={281-311},
year={1996},
}

Gerhard Huisken, and Shing-Tung Yau. Definition of center of mass for isolated physical systems and unique foliations by stable spheres with constant mean curvature. 1996. Vol. 124. In Inventiones mathematicae. pp.281-311. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203558515927055.