@article{ref1,
title="Crowding Models, Stress, and Wilderness",
journal="Mass emergencies",
year="1976",
author="Nielsen, JMC",
volume="1",
number="4",
pages="249-260",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0304-4114",
doi="",
url="http://dx.doi.org/"
}