@article{ref1,
title="The effects of moderately elevated ambient carbon dioxide levels on human physiology and performance: a joint NASA-ESA-DARA study--overview",
journal="Aviation, space, and environmental medicine",
year="1998",
author="Frey, M. A. and Sulzman, F. M. and Oser, H. and Ruyters, G.",
volume="69",
number="3",
pages="282-284",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-6562",
doi="",
url="http://dx.doi.org/"
}