@article{ref1,
title="Play in infancy and childhood",
journal="British journal of physical medicine",
year="1954",
author="Ratcliffe, T. A.",
volume="17",
number="4",
pages="87-90",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0366-2616",
doi="",
url="http://dx.doi.org/"
}