@article{ref1,
title="Impairment of mental performance at a simulated altitude of 8,000 feet",
journal="Aerospace medicine",
year="1969",
author="Kelman, G. R. and Crow, T. J.",
volume="40",
number="9",
pages="981-982",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}