@article{ref1,
title="Space utilization: criteria for the selection of playground equipment for children",
journal="Research quarterly",
year="1976",
author="Thompson, D.",
volume="47",
number="3",
pages="472-483",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0034-5377",
doi="",
url="http://dx.doi.org/"
}