@article{ref1,
title="The Invariance of Structural Covariates: Reflections on 20 Years of Homicide Research",
journal="Homicide studies",
year="2010",
author="McCall, P. L.",
volume="14",
number="3",
pages="215-218",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1088-7679",
doi="10.1177/1088767910375351",
url="http://dx.doi.org/10.1177/1088767910375351"
}