Bekele, A. ., M. F. Viljoen, and G. Ayele. “Effect of Farm Size on Technical Efficiency of Tef Production: A Case Study of the Moretna-Jirru District, Central Ethiopia”. Ethiopian Journal of Development Research, vol. 27, no. 1, Dec. 2022, pp. 1-24, http://ejol.aau.edu.et/index.php/EJDR/article/view/3402.