@article{ref1,
title="Camps and camping",
journal="American journal of public health",
year="1949",
author="Levine, M. I. and Leighty, H. and Sharp, L. B.",
volume="39 - 2",
number="5",
pages="128-133",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}