4Anderson J. A Theoretical Foundation for the Gravity Equation [ J ]. American Economic Review, 1979, 69 (1) :106 -116.
5Tinbergen J. Shaping the World Economy, Appendix V1, "An Analysis of World Trade Flows" [ M]. New York: Twentieth Century Fund, 1962.
6Poyhoncn P. A Tentative Model For the Flows of Trade Between Countries [ J]. Weltwirtschatftliches Archiv, 1963, 90( 1 ) : 93 - 99.
7Linnermann H, An Econometric Study of International Trade Flows[ M]. Amsterdam: North-Holland Publishing Company, 1966.
8Bergstrand J. The Generalized Gravity Equation, Monopolistic Competition, and the Factor-Proportions Theory in International Trade [ J]. Re- view of Economics and Statistics,1989,71 : 143 - 153.
9Evenett S, W Keller. On Theories Explaining the Success of the Gravity Equation [ J ]. Journal of Political Economy, 2002, 110:281 - 312.
10Chan-Hyun Sohn. Does the Gravity Model explain South Korea's Trade Flows? [J]. The Japanese Economic Review, 2005, 56(4) : 417 -430.