@article{ref1,
title="Effect of 1St-Grade Classroom Environment on Shy Behavior, Aggressive-Behavior, and Concentration Problems",
journal="American journal of community psychology",
year="1991",
author="Werthamerlarsson, L and Kellam, Sheppard and Wheeler, L",
volume="19",
number="4",
pages="585-602",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0091-0562",
doi="",
url="http://dx.doi.org/"
}