@article{ref1,
title="Social identity and some aspects of ingroup hostility -- perceptual biases against black sheep",
journal="Aggressive behavior",
year="1990",
author="Fraczek, A and Linneweber, V",
volume="16",
number="2",
pages="113-113",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0096-140X",
doi="",
url="http://dx.doi.org/"
}