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The Population Density and War Proneness of European Nations (Stuart J. Bremer, David Singer and Urs Lutenbacher, 1979) Diagrammed by: Sarah Gansen and Patrick James
The macro and micro levels of this system correspond, respectively, to the discipline as a whole and individual scholars within it.
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Political Aftershocks: The Impact of Earthquakes on Intrastate Conflict (Brancati, 2007)
The macro and micro levels of this system correspond, respectively, to government and society.