1. Aiyar, S. and Ruthbah, U. Where did all the aid go? An empirical analysis of absorption and spending. Working Paper 08/34. Washington, DC: International Monetary Fund.
2. Berg, A., Aiyar, S., Hussain, M., Roache, S., Mirzoev, T. and Mahone, A. The macroeconomics of scaling up aid: lessons from recent experience. Occasional Paper 253. Washington, DC: International Monetary Fund.
3. Unit root tests for panel data