@article{ref1,
title="International political terrorism: a challenge for comparative research",
journal="Terrorism",
year="1980",
author="Szabo, Denis and Crelinsten, Ronald D.",
volume="3",
number="3-4",
pages="341-348",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0149-0389",
doi="10.1080/10576108008435480",
url="http://dx.doi.org/10.1080/10576108008435480"
}