@article{ref1,
title="Worker fatalities due to excavation cave-ins",
journal="MMWR: Morbidity and mortality weekly report",
year="1986",
author="",
volume="35",
number="4",
pages="49-50",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0149-2195",
doi="",
url="http://dx.doi.org/"
}