1. Mathematical Analysis for Economists;Allen,1962
2. Inferior inputs and the theory of the firm;Bear;The Journal of Political Economy,1965
3. The Theory of Effective Protection;Bhagwati,1971
4. Duality, Intermediate Inputs and Value Added;Bruno,1971
5. The structure of a tariff system and the effective protective rate;Corden;Journal of Political Economy,1966