@article{ref1,
title="Age distribution of exposed populations",
journal="Health physics",
year="1988",
author="Harley, J. H.",
volume="55",
number="4",
pages="703-704",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0017-9078",
doi="",
url="http://dx.doi.org/"
}