1. Aggarwal, P.K., Hebbar, K.B., Venugopalan, M.V., et al., 2008. Quantification of yield gaps in rain-fed rice, wheat, cotton and mustard in India. Global Theme on Agroecosystems Report no. 32. Patancheru, Andhra Pradesh, India: International Crops Research Institute for the Semi-Arid Tropics.
2. Alexandratos, N., Bruinsma, J., 2012. World agriculture towards 2030/2050: The 2012 revision. ESA Working Paper No. 12-03. Rome: Food and Agriculture Organization of the United Nations.
3. Shifting patterns of global agricultural productivity: Synthesis and conclusion;Alston,2010
4. Agricultural research, productivity, and food prices in the long run;Alston;Science,2009
5. Influences of agricultural technology on the size and importance of food price variability;Alston,2013