@article{ref1,
title="A brief history of a "20th Century Danger Sign"",
journal="Health physics",
year="1979",
author="Stephens, L. D. and Barrett, Robert",
volume="36",
number="5",
pages="565-571",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0017-9078",
doi="",
url="http://dx.doi.org/"
}