Peetha, V. R., and G. R. P. “FORMULATION AND IN VITRO EVALUATION OF BUCCAL TABLETS OF METOPROLOL SUCCINATE ”. International Research Journal of Pharmaceutical and Applied Sciences, Vol. 3, no. 2, Apr. 2013, pp. 102-11, https://scienztech.org/index.php/irjpas/article/view/615.