@article{ref1,
title="Field study of transport aircrew workload and rest",
journal="Aerospace medicine",
year="1971",
author="Hartman, B. O.",
volume="42",
number="8",
pages="817-821",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}