4Fervavdez, R.J.Portes, "Returns to Regionalism:An Analysis of Nontraditional Gains from Regional Trade Agreements" The World Bank Economic Review. Vol.12,No.2, 1998, pp.197-220.
5Perrovi,C.,John Whalley, "The New Regionalism:Trade Liberalization or Insurance?"Canadian Journal of Economics. Vol.33, No. 1,2002 ,PP. 1-24
