最近在写引力模型综述，想找几篇70 80年代的经典论文，不知道为什么GOOGLE学术下载不下来，
Anderson, J.E., 1979，A Theoretial Foundation for the Gravity Equation, American Econimic REview,
Bergstrand J. 1985，The Gravity Equation in International Trade: Some Microeconomic Foundations and Empirical Evidence[ J] . Review of Economics and Statistics,
Helpman, Elhanan and Paul Krugman (1985) Market Structure and Foreign Trade
Deardorff, Alan V. (1998) “Determinants of Bilateral Trade: Does Gravity Work in a Neoclassical World?”
哪位大虾有这些论文，可否发至小妹邮箱，或者提供下载链接也可
zhanghannahsmile@hotmail.com
在此拜谢
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