@article{ref1,
title="Bioterrorism. Smallpox vaccinations: how much protection remains?",
journal="Science",
year="2001",
author="Cohen, John",
volume="294",
number="5544",
pages="985-985",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0036-8075",
doi="10.1126/science.294.5544.985",
url="http://dx.doi.org/10.1126/science.294.5544.985"
}