@article{ref1,
title="Health costs associated with the mining, transport and combustion of coal in the steam-electric industry",
journal="Nature",
year="1974",
author="Sagan, L. A.",
volume="250",
number="462",
pages="107-111",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-0836",
doi="",
url="http://dx.doi.org/"
}