2Global Economic Prospects 2005,World Bank Report,p.28,83,125,70.
3OECD,Trade Blocks,2001,pp.11,28.
4Global Economic Prospects 2005,World Bank Report,p.68.
5Schiff Maurice and L.Alan Winters,Regionalism and Develop-ment,New York:Oxford University Press,2003,p.128.
6Jacob Viner,The Custorns Union Issue,London,Stevens & Sons Limited for the Carnegie Endowment for International Peace,1950,p.11.
7Anderson, J.E. A Theoretical Foundation for the Gravity Equation[J]. American Economic Review,1979, 69, 106-116.
8Anderson, J.E. and Wincoop. E. Gravity with Gravitas:A Soulution to the Border Puzzle[J].American Economic Review,2003,93,170-192.
9Anderson,M. and Smith,S. Do National Borders Really Matter Canada-U. S Regional Trade Re considered[J],Review of International Economics,1999,7,219-227.
10Bergstrand,J.H. The Gravity Equation in International Trade:Some microeconomic Foundations and Empirical Evidence[J]. Review of Economics and Statistics,1985,, 67 474-481.
