Elasraag, Yahia H., and Silverio Alarcón. “Global Malmquist Indices of Productivity Change in Egyptian Wheat Production”. Spanish Journal of Agricultural Research 15, no. 2 (July 31, 2017): e0111. Accessed August 1, 2026. https://sjar.revistas.csic.es/index.php/sjar/article/view/10548.