@article{ref1,
title="Historical trends related to bioterrorism: An empirical analysis",
journal="Emerging infectious diseases",
year="1999",
author="Tucker, J. B.",
volume="5",
number="4",
pages="498-504",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1080-6040",
doi="",
url="http://dx.doi.org/"
}