@article{ref1,
title="Medical evaluation of airmen exposed to altitudes in excess of 50,000 feet",
journal="Aerospace medicine",
year="1965",
author="Barron, C. I. and Schwichtenberg, A. H. and Secrest, R. R.",
volume="36",
number="",
pages="665-668",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}