@inproceedings{alexander2018isoperimetric,
title={Isoperimetric characterization of upper curvature bounds},
author={Alexander Lytchak, and Stefan Wenger},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191128114328696168539},
booktitle={Acta Mathematica},
volume={221},
number={1},
pages={159 – 202},
year={2018},
}
Alexander Lytchak, and Stefan Wenger. Isoperimetric characterization of upper curvature bounds. 2018. Vol. 221. In Acta Mathematica. pp.159 – 202. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191128114328696168539.