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Abul Naga, Ramses H. (1997) Prediction and sufficiency in the model factor analysis. DARP, 31. Suntory and Toyota International Centres for Economics and Related Disciplines, London School of Economics and Political Science, London, UK.
Kondylis, Florence (2005) Agricultural returns and conflict: quasi-experimental evidence from a policy intervention programme in Rwanda. CEPDP, 709. Centre for Economic Performance, London School of Economics and Political Science, London, UK. ISBN 0753019078