向各位求下列文献:先谢过

1.Rudiger Dornbusch,etc:Comparative Advantage, Trade, and Payments in a Ricardian Model with a Continuum of Goods

2.G. D.A.MacDougall:British and American Exports;A Study Suggested by the Theory of Comparative Costs.

3.An Empirical Demonstration of Classical Comparative Cost Theory