@article{ref1,
title="Aviator performance and the use of hypnotic drugs",
journal="Aerospace medicine",
year="1972",
author="Harper, C. R. and Kidera, G. J.",
volume="43",
number="2",
pages="197-199",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}