D. Nedaw, N. T. Tafesse, K. Woldearegay, T. Gebreyohannes, F. V. Steenbergen, and L. Willibald, “Groundwater Based Irrigation and Food Security in Raya-Kobo Valley, Northern Ethiopia”, AREES, vol. 5, no. 1, pp. 15–21, Dec. 2018.