Mansfield, Edward, Helen Milner, and Peter Rosendorff. (2002) 2002. “Replication, Realism, and Robustness: Analyzing Political Regimes and International Trade”. American Political Science Review 96 (1): - 169. Referenced from search.proquest.com: Replication, Realism, and Robustness: Analyzing Political Regimes and International Trade.