@article{ref1,
title="The toxicity classification of Th-nat and U-nat",
journal="Health physics",
year="1972",
author="Duggan, M. J.",
volume="22",
number="1",
pages="102-103",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0017-9078",
doi="",
url="http://dx.doi.org/"
}