@article{ref1,
title="A study of the relationship of street level carbon monoxide concentrations to traffic accidents",
journal="American Industrial Hygiene Association journal",
year="1960",
author="Clayton, G. D. and Cook, W. A. and Fredrick, W. G.",
volume="21",
number="",
pages="46-54",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0002-8894",
doi="",
url="http://dx.doi.org/"
}