@article{ref1,
title="The better angels of our nature: why violence has declined",
journal="Psychiatric services",
year="2014",
author="Stone, Alan A.",
volume="65",
number="5",
pages="e07-e08",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1075-2730",
doi="10.1176/appi.ps.650510",
url="http://dx.doi.org/10.1176/appi.ps.650510"
}