@article{2013-J-CGTA-RiemannianCenter,
author={Marc Arnaudon and Frank Nielsen},
title={On approximating the {R}iemannian {$1$}-center},
journal={Computational Geometry},
volume={46},
number={1},
pages={93-104},
doi={10.1016/j.comgeo.2012.04.007},
year={2013}
}