@article{ref1,
title="Tornado disaster--Pennsylvania",
journal="MMWR: Morbidity and mortality weekly report",
year="1986",
author="Centers for Disease Control and Prevention, USA, ",
volume="35",
number="14",
pages="233-235",
abstract="Abstract unavailable.",
language="en",
issn="0149-2195",
doi="",
url="http://dx.doi.org/"
}