@article{ref1,
title="The Dynamics of Conflict and Cooperation between Nations. A Computer Simulation and Some Results",
journal="Journal of peace research",
year="1975",
author="Ruloff, Dieter",
volume="12",
number="2",
pages="109-121",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0022-3433",
doi="10.1177/002234337501200203",
url="http://dx.doi.org/10.1177/002234337501200203"
}