@article{ref1,
title="Playground safety",
journal="Journal of Pediatric Health Care",
year="1992",
author="Swartz, M. K.",
volume="6",
number="3",
pages="161-162",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0891-5245",
doi="",
url="http://dx.doi.org/"
}