@article{ref1,
title="When kids kill: Columbine High School shooting",
journal="Emergency medical services",
year="1999",
author="Nordberg, M.",
volume="28",
number="10",
pages="39-47, 49",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0094-6575",
doi="",
url="http://dx.doi.org/"
}