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Ryan, J G and Spencer, D C (2001) Future Challenges and Opportunities for Agricultural R&D in the Semi-Arid Tropics. Monograph. International Crops Research Institute for the Semi-Arid Tropics.
Ryan, J G and Spencer, D C (2002) Défis et opportunités futurs pour la R&D dans les régions tropicales semi-arides. Monograph. International Crops Research Institute for the Semi-Arid Tropics.