1. Balassa B (1971) Evaluation of the system of protection. In: Balassa B et al (eds) The structure of protection in developing countries. Johns Hopkins, Baltimore
2. Bergsman J (1974) Commercial policy, allocative efficiency and ‘X-efficiency’. Q J Econ 88(3):409–433
3. Bhagwati J (1968) The theory and practice of commercial policy: departures from unified exchange rates, Special Papers in International Economics, No. 8, Princeton: Princeton University Press, 1–69 (Frank Graham Lecture, 1967)
4. Bhagwati J (1982) Directly unproductive profit-seeking (DUP) activities. J Polit Econ 90:988–1002
5. Ethier WJ (1982) National and international returns to scale in the modern theory of international trade. Am Econ Rev 72(3):389–405