1. Acemoglu, D., Johnson, S. and Robinson, J. The colonial origins of comparative development. NBER Working Paper 7771. Cambridge, MA. National Bureau of Economic Research.
2. Agbeyegbe, T., Stotsky, J. G. and Wolde-Mariam, A. Trade liberalization, exchange rate changes, and tax revenue in sub-Saharan Africa. IMF Working Paper WP/04/178, International Monetary Fund. Washington, DC.
3. Official development assistance to Africa: an overview