@inproceedings{wenxue2015on,
title={On Bonnesen-type inequalities for a surface of constant curvature},
author={Wenxue Xu, Jiazu Zhou, and Baocheng Zhu},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170303222331164125606},
booktitle={Proc. Amer. Math. Soc.},
volume={143},
number={11},
pages={4925-4935},
year={2015},
}
Wenxue Xu, Jiazu Zhou, and Baocheng Zhu. On Bonnesen-type inequalities for a surface of constant curvature. 2015. Vol. 143. In Proc. Amer. Math. Soc.. pp.4925-4935. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170303222331164125606.