@article{ref1,
title="The diffusion of collective violence",
journal="American sociological review",
year="1978",
author="Pitcher, B. L. and Hamblin, Robert L. and Miller, J. L.",
volume="43",
number="1",
pages="23-35",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0003-1224",
doi="",
url="http://dx.doi.org/"
}