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 Williamson, O.E. (2000) The New Institutional Economics: Taking Stock, Looking Ahead. Journal of Economic Literature, 38, 595-613. http://dx.doi.org/10.1257/jel.38.3.595
 Rodrik, D. (2008) Second-Best Institutions. American Economic Review, 98, 100-104.
 Kandel, A. and Langholz, G. (1993) Fuzzy Control Systems. CRC Press, Boca Raton, FL, USA.
 Tsebelis, G. (1995) Decision Making in Political Systems: Veto Players in Presidentialism, Parliamentarianism, Multicameralism and Multipartyism. British Journal of Political Science, 25, 289-325.