Alvarez, M. , Cheibub, J. A., Limongi, F., and Przeworski, A. (1996). Classifying political regimes. Studies in Comparative International Development, 31(2), 3-36.
2.
Collier, D. , & Adcock, R. (1999). Democracy and dichotomies: A pragmatic approach to choices about concepts. In Annual Review of Political Science (Vol. 2). N. W. Polsby. Palo Alto, CA: Annual Review.
3.
Elkins, Z. (2000). Gradations of democracy? Empirical test of alternative conceptualizations. American Journal of Political Science, 44(2), 293-300.
4.
Gleditsch, K. S. (1999). Peace has its victories, no less renowned than war: A local interaction approach to regional conflict, integration, and democratization. Ph.D. dissertation, University of Colorado, Department of Political Science, Boulder, CO.
5.
Sen, A. (1998). Development as freedom. New York: Anchor.
6.
Simon, J. (1992). There is no low-level fertility-and-development trap. In J. Simon (Ed.), Population and development in poor countries. Princeton, NJ: Princeton University Press.
7.
Encarnación, O. (2000). Beyond transitions: The politics of democratic consolidation. Comparative Politics, 32(4), 479-498.
8.
Schmitter, P. (1992). The consolidation of democracy and the representation of social groups. American Behavioral Scientist, 35, 422-449.