Kalyani, V., et al. “FORMULATION AND CHARACTERIZATION OF MUCOADHESIVE BUCCAL TABLETS OF METOPROLOL SUCCINATE BY USING XANTHUM GUM”. Asian Journal of Pharmaceutical Research and Development, vol. 2, no. 1, Jan. 2014, pp. 68-74, https://ajprd.com/index.php/journal/article/view/262.