The role of climate in the trend and variability of Ethiopia's cereal crop yields - Yang, Meijian; Wang, Guiling; Ahmed, Kazi Farzan; Adugna, Berihun; Eggen, Michael; Atsbeha, Ezana; You, Liangzhi; Koo, Jawoo; Anagnostou, Emmanouil (Elsevier, 2020)