Trend Analysis of Climatic and Hydrological Variables in the Awash River Basin, Ethiopia oleh Mohammed Gedefaw, Hao Wang, Denghua Yan, Xinshan Song, Dengming Yan, Guaqiang Dong, Jianwei Wang, Abel Girma, Babar Aijaz Ali, Dorjsuren Batsuren, Asaminew Abiyu, Tianling Qin