@article{ref1,
title="Indoor and outdoor carbon monoxide measurements at an airport",
journal="Journal of the Air Pollution Control Association",
year="1980",
author="Bellin, P. and Spengler, J. D.",
volume="30",
number="4",
pages="392-394",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-2470",
doi="",
url="http://dx.doi.org/"
}