1. Changes in the demand for skilled labor within US manufacturing;Berman;Quarterly Journal of Economics,1994
2. Berman, E., Machin, S., Bound, J., 1996. Implications of skill-biased technological change: International evidence, Mimeo., March.
3. Bhagwati, J., 1991. Free traders and free immigrationists: Strangers or friends? Working paper 20, Russell Sage Foundation, April.
4. Minimum wage rates and the pure theory of international trade;Brecher;Quarterly Journal of Economics,1974
5. Center for Economic Policy Research (CEPR) 1995. Unemployment: Choices for Europe, Monitoring European Integration, vol. 5, CEPR, London.