1. New sorghum and millet cultivar introduction in Sub-Saharan Africa: Impacts and research agenda;Ahmed;Agric. Syst.,2000
2. Anderson , C.L. Lipper , L. Bellon , M. 2006 The Effect of Environmental Sources of Crop Loss on Farmers’ Willingness to Pay in Chiapas, Mexico http://evans.washington.edu/files/EvansWorkingPaper-2006-02.pdf
3. Risk, efficiency, and the adoption of modern crop varieties. Evidence from the Philipinnes;Antle;Econ. Dev. Cult. Change,1990
4. Baumgärtner , S. 2002 Measuring the diversity of what? And for what purpose? A conceptual comparison of ecological and economic measures of biodiversity http://www.eco.uni-heidelberg.de/ng-oeoe/research/papers/DivMeas.pdf
5. The dynamics of crop infraspecific diversity: A conceptual framework at the farmer level;Bellon;Econ. Botany,1996