Mekonnen, N., E. Makonnen, and K. Gebre-Tsadik. “Behavioural Changes and Development of Tolerance to Repeated Administration of Khat (Catha Edulis Forsk) in Mice”. The Ethiopian Journal of Health Development, vol. 12, no. 3, Mar. 2017, https://ejhd.org/index.php/ejhd/article/view/986.