@article{ref1,
title="Mortality of British coal miners in 1961",
journal="British journal of industrial medicine",
year="1973",
author="Liddell, F. D.",
volume="30",
number="1",
pages="15-24",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-1072",
doi="",
url="http://dx.doi.org/"
}