Roy, S. K., S. Naskar, S. Kundu, and K. Koutsu. “FORMULATION AND EVALUATION OF SUSTAINED RELEASE BILAYER TABLETS OF PROPRANOLOL HYDROCHLORIDE”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 7, no. 4, Apr. 2015, pp. 264-9, https://journals.innovareacademics.in/index.php/ijpps/article/view/4037.