@article{ref1,
title="Human stampedes: a systematic review of historical and peer-reviewed sources",
journal="Disaster medicine and public health preparedness",
year="2009",
author="Ngai, Ka Ming and Burkle, Frederick M. and Hsu, Anthony and Hsu, Edbert B.",
volume="3",
number="4",
pages="191-195",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1935-7893",
doi="10.1097/DMP.0b013e3181c5b494",
url="http://dx.doi.org/10.1097/DMP.0b013e3181c5b494"
}