@article{ref1,
title="Playgrounds for the mentally retarded",
journal="American journal of occupational therapy",
year="1974",
author="Smiley, C. W.",
volume="28",
number="8",
pages="474-477",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0272-9490",
doi="",
url="http://dx.doi.org/"
}