@inproceedings{agarwal05staying,
    author="Pankaj K. Agarwal, Mark de Berg, Jie Gao, Leonidas J. Guibas, Sariel Har-Peled",
    title="Staying in the Middle: Exact and Approximate Medians in $R^1$ and $R^2$ for Moving Points",
    booktitle="Proc. of the 17th Canadian Conference on Computational Geometry (CCCG’05)",
    pages="42--45",
    month="August",
    year="2005"
}