Poudel, Mahadeb Prasad, and Shwu-En Chen. “Trends and Variability of Rice, Maize, and Wheat Yields in South Asian Countries: A Challenge for Food Security”. Asian Journal of Agriculture and Rural Development 2, no. 4 (December 20, 2012): 584–597. Accessed November 22, 2024. https://archive.aessweb.com/index.php/5005/article/view/624.