@article{ref1,
title="The meaning of play",
journal="Heilpädagogische Werkblätter",
year="1950",
author="Adank, M.",
volume="19",
number="4",
pages="176-184",
abstract="<p>[Abstract unavailable]</p><p>Language: un</p>",
language="un",
issn="",
doi="",
url="http://dx.doi.org/"
}