1. Aksoy MA, Beghin MC (2003) Global Agricultural Trade and Developing Countries. World Bank, Washington
2. Alston JM, Norton GW, Pardey PG (1995) Science under Scarcity: principles and Practice for Agricultural Research Evaluation and Priority Setting. Cornell University Press in cooperation with the International Service for National Agricultural Research, Ithaca and London
3. Alston JM, Marra MC, Pardey PG, Wyatt TJ (2000) A meta analysis of rates of return to agricultural R&D: Ex pede Herculem? Research Report, vol 113. IFPRI, Washington, DC
4. Bell MA, Fischer RA, Byerlee D, Sayre K (1995) Genetic and agronomic contributions to yield gains: a case study for wheat. Field Crops Res 44:55–56
5. Byerlee D (1994) Modern Varieties, Productivity, and Sustainability: Recent Experience and Emerging Challenges. CIMMYT, Mexico, DF