@article{ref1,
title="Grey relationship analysis on causes of road traffic accidents",
journal="IATSS research",
year="1999",
author="Wei, Zheng and Sun, Xiaoduan",
volume="23",
number="1",
pages="125-128",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}