@article{ref1,
title="Fatigue countermeasures and the use of hypnotics in aircrew",
journal="Aviation, space, and environmental medicine",
year="2009",
author="Nicholson, A. N.",
volume="80",
number="4",
pages="418; author reply 418-418; author reply 418",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-6562",
doi="",
url="http://dx.doi.org/"
}