Tadesse, W., G. Desalegn, and R. Alia. “Natural Gum and Resin Bearing Species of Ethiopia and Their Potential Applications”. Forest Systems 16, no. 3 (December 1, 2007): 211-221. Accessed April 27, 2024. https://fs.revistas.csic.es/index.php/fs/article/view/1010.