@article{ref1,
title="Occupational exposures to carbon monoxide in Baltimore firefighters",
journal="Journal of Occupational Medicine",
year="1976",
author="Radford, E. P. and Levine, M. S.",
volume="18",
number="9",
pages="628-632",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0096-1736",
doi="",
url="http://dx.doi.org/"
}