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Theories of Democratic Consolidation: A Mexico-Germany Comparison Welzel, C., Inglehart, R. and Klingemann, H-D. (2003) ‘Human Development as a Theory of Social Change: A Cross-Cultural Perspective’ European Journal of Political Science 42(3): 341-379. Welzel, Christian (2009) ‘Theories of Democratization’ in Haerpfer, C. W., Bernhagen, P., Inglehart, R. F. and Welzel, C. (eds.) Democratization. Oxford: Oxford University Press, pp. 74-99. 91