“Evaluation of a Hydrophobic–Hydrophilic (Hydrogenated Castor Oil-Gum Tragacanth) Matrix using Propranolol Hydrochloride as Test Drug” (2018) The East and Central African Journal of Pharmaceutical Sciences, 10(3), pp. 68–71. Available at: http://jsep.uonbi.ac.ke/ojs/index.php/ecajps/article/view/65 (Accessed: 15 June 2026).