@article{ref1,
title="PRELIMINARY guide for measuring work absence due to illness and injury",
journal="Journal of the American Medical Association",
year="1958",
author="",
volume="168",
number="9",
pages="1230-1232",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9955",
doi="",
url="http://dx.doi.org/"
}