@article{ref1,
title="Some medical aspects of United States military air transportation. II. Air crews",
journal="World medical journal",
year="1956",
author="Braswell, L. R.",
volume="3",
number="1",
pages="13-16",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0049-8122",
doi="",
url="http://dx.doi.org/"
}