@article{ref1,
title="Methods to reduce carbon monoxide levels at the workplace",
journal="Preventive medicine",
year="1979",
author="Haag, W. M.",
volume="8",
number="3",
pages="369-378",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0091-7435",
doi="",
url="http://dx.doi.org/"
}