@article{ref1,
title="Measurement of pilot fatigue",
journal="Transactions of the Society of Occupational Medicine",
year="1967",
author="Preston, F. S.",
volume="17",
number="2",
pages="52-56",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0037-9972",
doi="",
url="http://dx.doi.org/"
}