8Tinbergen J.Shaping the world economy,appendix Ⅵ,an analysis of world trade flows[R].New York:Twentieth Century Fund,1962:209-220.
9Poyhonen P.A tentative model of the volume of trade between countries[J].Weltwirtschafiliches Archiv,1963,90(1):90-01.
10Gereffi G. Global production systems and third world development [ C ]//B Stallings( ed. ). Global change regional response. New York: Cambridge University Press, 1995:89 - 99.
