@article{ref1,
title="Changes in school playground and aggressive behavior reduction",
journal="Aggressive behavior",
year="2001",
author="Rebolo-Marques, A and Neto, C. and Pereira, BO",
volume="27",
number="3",
pages="191-191",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0096-140X",
doi="",
url="http://dx.doi.org/"
}