@article{ref1,
title="Shift work studies provide clues to industrial accidents",
journal="Occupational health and safety",
year="1987",
author="Krieger, G. R.",
volume="56",
number="1",
pages="20-2, 34",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0362-4064",
doi="",
url="http://dx.doi.org/"
}