Kumari, Satish, et al. “Formulation and Evaluation of Sustained Release Matrix Tablet of Metoprolol Succinate by Using Xanthan Gum and Carbopol”. Journal of Drug Delivery and Therapeutics, vol. 9, no. 3-s, June 2019, pp. 309-16, https://doi.org/10.22270/jddt.v9i3-s.2844.