@article{ref1,
title="The May 3, 1999, tornado in Oklahoma City",
journal="Annals of emergency medicine",
year="1999",
author="Hogan, D. E. and Askins, D. C. and Osburn, A. E.",
volume="34",
number="2",
pages="225-226",
abstract="Abstract unavailable.",
language="",
issn="0196-0644",
doi="",
url="http://dx.doi.org/"
}