@article{ref1,
title="Mortality rates among coal miners",
journal="American journal of public health",
year="1964",
author="Enterline, P. E.",
volume="54",
number="",
pages="758-768",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}