@article{ref1,
title="Study of real-time estimating method of dynamic crowd-density to prevent stampede accidents",
journal="Function and materials",
year="2011",
author="成幸, 三田地",
volume="31",
number="10",
pages="62-68",
abstract="English abstract unavailable.  Language: ja<p />",
language="",
issn="0286-4835",
doi="",
url="http://dx.doi.org/"
}