Seyoum, Assefa, Bazabih Emana, and Franze Gatzweiler. 2022. “Strict In-Situ Conservation of Coffea Arabica Genetic Resources in Yayu Forest Econometric Analysis and Options for Effectiveness of the Strategy”. Ethiopian Journal of Development Research 30 (2):35-81. http://ejol.aau.edu.et/index.php/EJDR/article/view/3417.