@article{ref1,
title="Play and exploration",
journal="Developmental medicine and child neurology",
year="1967",
author="Burn, J.",
volume="9",
number="3",
pages="347-348",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0012-1622",
doi="",
url="http://dx.doi.org/"
}