@article{ref1,
title="Adventure playgrounds",
journal="Medical world",
year="1956",
author="Allen, Marjory Gill",
volume="85",
number="2",
pages="155-158",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0025-7621",
doi="",
url="http://dx.doi.org/"
}