@article{ref1,
title="Are all ecological studies fallacious? Not necessarily",
journal="Health physics",
year="1997",
author="Patterson, H. W.",
volume="73",
number="4",
pages="711-712",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0017-9078",
doi="",
url="http://dx.doi.org/"
}