“Evaluation of a Hydrophobic–Hydrophilic (Hydrogenated Castor Oil-Gum Tragacanth) Matrix using Propranolol Hydrochloride as Test Drug”, East Cent. Afr. J. Pharm. Sci., vol. 10, no. 3, pp. 68–71, Nov. 2018, Accessed: Jun. 15, 2026. [Online]. Available: http://jsep.uonbi.ac.ke/ojs/index.php/ecajps/article/view/65