2Anderson, J. E (1979): ″The Theoretical Foundation for the Gravity Equation.″ American Economic Review, Vol. 69, No l.
3Matyas, L. (1997), ″Proper Econometric Specification of the Gravity Model″, The World Economy,Vol.20,No.3, PP.363-368.
4Fidrmuc, Jan and Jarko Fidrmuc(2000),″Disintegration and Trade″, CEPS Discussion Paper 2641.
5Peter Egger and Michael Pfaffermayr, ″Foreign Direct Investment and European Integration in the 90′s, University of Innsbruck, Working Papers in Economics, 2002. 2.
6Cheng and J.W. Howard (1999), ″Controlling for Heterogeneity in Gravity Models of Trade″ FRBSL Working Paper No.99-010A, Federal Reserve Bank of StLouis.
7Di Mauro. F.(2000), ″The impact of Economic Integration on FDI and Exports: A Gravity Approach″, CEPS Working Document156.
