@article{ref1,
title="Historical development of civil aviation medical standards",
journal="Aviation, space, and environmental medicine",
year="1992",
author="Dille, J. R.",
volume="63",
number="3",
pages="237-238",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0095-6562",
doi="",
url="http://dx.doi.org/"
}