@article{ref1,
title="Atmospheric background concentrations of carbon monoxide",
journal="Annals of the New York Academy of Sciences",
year="1970",
author="Robinson, Elizabeth and Robbins, R. C.",
volume="174",
number="1",
pages="89-95",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="",
url="http://dx.doi.org/"
}