1. Ali, N., & Naajman, B. (2015, June 22–25). Informal Competition and Productivity in Sub-Saharan Africa. Paper Presented at the Annual Meeting of the French Economic Association, Rennes-Frances.
2. Arias, O., Blom, A., Bosch, M., Cunningham, W., Fiszbein, A., Acevedo, G. L., et al. (2005, December). Pending Issues in Protection, Productivity Growth, and Poverty Reduction. World Bank Policy Research Working Paper 3799.
3. Atchoarena, D., & Delluc, A. M. (2001). Revisiting Technical and Vocational Education in Sub-Saharan Africa: An Update on Trends, Innovations, and Challenges. IIEP/Prg.DA/1320. Paris: International Institute for Educational Planning.
4. Aterido, R., Hallward-Driemeier, M., & Pages, C. (2007, November). Investment Climate and Employment Growth: The Impact of Access to Finance, Corruption and Regulations Across Firms. IZA Discussion Paper No. 3138.
5. Azuma, Y., & Grossman, H. I. (2002). A Theory of the Informal Sector. NBER Working Paper 8823. National Bureau of Economic Research, Inc.