@article{ref1,
title="Coal smoke and mortality of the elderly",
journal="Nature",
year="1974",
author="Eddy, T. P.",
volume="251",
number="5471",
pages="136-138",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-0836",
doi="",
url="http://dx.doi.org/"
}