@article{ref1,
title="Is regulation effective? A case study of underground coal mining",
journal="Annals of the New York Academy of Sciences",
year="1989",
author="Weeks, J. L.",
volume="572",
number="",
pages="189-99; discussion 221",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="",
url="http://dx.doi.org/"
}