@article{ref1,
title="Study of Models of Speed-Flow for Freeways",
journal="Zhongguo Gonglu Xuebao",
year="2000",
author="Zhang, Yunlong and Zhang, Qinglin",
volume="13",
number="3",
pages="73-77",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1001-7372",
doi="",
url="http://dx.doi.org/"
}