@article{2003-J-Algorithmica-PiercingSetIntervals,
author={Matthew J. Katz and Frank Nielsen and Michael Segal},
title={Maintenance of a piercing set for intervals with applications},
journal={Algorithmica},
volume={36},
number={1},
pages={59-73},
doi={10.1007/s00453-002-1006-1},
year={2003}
}