1. Determinants of the commodity structure of U.S. trade;Baldwin;American Economic Review,1971
2. Human capital;Becker,1964
3. The pure theory of international trade: A survey;Bhagwati;Economic Journal,1964
4. Trends in U.S. trade and comparative advantage;Branson;Brookings Papers on Economic Activity,1971
5. Comment on Griliches;Conlisk,1970