@article{ref1,
title="More on political violence",
journal="American political science review",
year="1976",
author="Haag, Ernest van den",
volume="70",
number="2",
pages="556-556",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-0554",
doi="10.1017/S0003055400299292",
url="http://dx.doi.org/10.1017/S0003055400299292"
}