Villani, Lorenzo, Giulio Castelli, Eyasu Yazew Hagos, and Elena Bresci. “Water Productivity Analysis of Sand Dams Irrigation Farming in Northern Ethiopia”. Journal of Agriculture and Environment for International Development (JAEID) 112, no. 1 (June 28, 2018): 139-160. Accessed June 27, 2022. https://www.jaeid.it/index.php/jaeid/article/view/11157.