Huth, Paul and Todd Allee( 2002) The International Peace and Territorial Conflict in the Twentieth Century. New York: Cambridge University Press. total Bias and War', American Economic Review 97(4): 1353-73.
World Development specifications. The Global Competitiveness Report: 2010-11. Geneva: World Economic Forum. The Global Competitiveness Report: 2011-12. Geneva: World Economic Forum. The Global Competitiveness Report: 2012-13. Geneva: World Economic Forum.