@inproceedings{seung2009a,
title={A simple proof of the Cucker-Smale flocking dynamics and mean-field limit},
author={Seung Yeal Ha, and Jian-Guo Liu},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170209001042186083346},
booktitle={Communications in Mathematical Sciences},
volume={7},
number={2},
pages={297-325},
year={2009},
}

Seung Yeal Ha, and Jian-Guo Liu. A simple proof of the Cucker-Smale flocking dynamics and mean-field limit. 2009. Vol. 7. In Communications in Mathematical Sciences. pp.297-325. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170209001042186083346.