@article{ref1,
title="The Lessons of Columbine, Part I",
journal="American behavioral scientist",
year="2009",
author="Muschert, G. W. and Spencer, J. W.",
volume="52",
number="9",
pages="1223-1226",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0002-7642",
doi="10.1177/0002764209332550",
url="http://dx.doi.org/10.1177/0002764209332550"
}