@article{ref1,
title="A note on the sleep of shift workers",
journal="Ergonomics",
year="1968",
author="Tune, G. S.",
volume="11",
number="2",
pages="183-184",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}