@article{ref1,
title="Five year study of general aviation physical examinations",
journal="Aerospace medicine",
year="1973",
author="Moore, W. S. and Wick, R. L. and Billings, C. E.",
volume="44",
number="1",
pages="78-79",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}