@article{ref1,
title="Premeditated mass shootings in schools: threat assessment",
journal="Journal of the American Academy of Child and Adolescent Psychiatry",
year="2002",
author="Twemlow, S. W. and Fonagy, Peter and Sacco, Frank C. and Otoole, ME and Vernberg, Eric",
volume="41",
number="4",
pages="475-477",
abstract="Abstract unavailable.",
language="",
issn="0890-8567",
doi="",
url="http://dx.doi.org/"
}