@article{ref1,
title="Why Has the United States Not Been Attacked Again?",
journal="Washington quarterly",
year="2009",
author="Boyd, D. and Dunn, Lewis A. and Scouras, J.",
volume="32",
number="3",
pages="3-3",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0163-660X",
doi="10.1080/01636600903010988",
url="http://dx.doi.org/10.1080/01636600903010988"
}