Girmay, M., and T. Berihun. “Adaptation Potential of Opuntia Ficus-Indica Along Altitudinal Gradient of Gullele Botanical Garden, Addis Ababa”. Ethiopian Journal of Environment and Development, vol. 7, no. 2, Dec. 2025, pp. 56-66, doi:10.20372/ejed.v07i2.05.