@article{ref1,
title="Child development and play--the meaning of play for children",
journal="Kangogaku zasshi",
year="1980",
author="Ueda, R. and Hanaoka, M.",
volume="44",
number="12",
pages="1251-1255",
abstract="<p>[Abstract unavailable]</p><p>Language: ja</p>",
language="ja",
issn="0386-9830",
doi="",
url="http://dx.doi.org/"
}