@inproceedings{
SuWan:13-041,
author={S. Su and Y. Wang and B. {D}e Schutter and X. Li and T.J.J. van den Boom
and T. Tang},
title={Energy-Efficient Operation of Subway Systems},
booktitle={Proceedings of the 92nd Annual Meeting of the Transportation Research
Board},
address={Washington, DC},
month=jan,
year={2013},
note={Paper 13-2451}
}