Raheem, Salsabeel, et al. “Caffeine Extraction from Spent Coffee Grounds by Solid-Liquid and Ultrasound-Assisted Extraction: Kinetic and Thermodynamic Study”. Iraqi Journal of Chemical and Petroleum Engineering, vol. 25, no. 1, Mar. 2024, pp. 49-57, https://doi.org/10.31699/IJCPE.2024.1.5.