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[Gelb, A.][Ngo, B.][Ye, X.]
Gelb, A., B. Ngo and X. Ye (2004). 'Implementing performance-based aid in Africa: The Country Policy and Institutional Assessment'. Africa Region Working Paper Series no. 77. Washington, DC: World Bank.
About CPIA: http://siteresources.worldbank.org/IDA/Resources/CPIA2004questionnaire.pdf