@article{ref1,
title="The Sociology of Conflict, I",
journal="American journal of sociology",
year="1904",
author="Simmel, Georg",
volume="9",
number="4",
pages="490-525",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0002-9602",
doi="10.1086/211234",
url="http://dx.doi.org/10.1086/211234"
}