@article{ref1,
title="Municipal Playgrounds in Chicago",
journal="American journal of sociology",
year="1898",
author="Zueblin, Charles",
volume="4",
number="2",
pages="145-158",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0002-9602",
doi="10.1086/210787",
url="http://dx.doi.org/10.1086/210787"
}