L. Winarti, B. T. Laksono, and L. O. R. K. Sari, “Optimization of Hydroxy Propyl Methyl Cellulose and Carbomer In Diltiazem Hydrochloride Mucoadhesive Buccal Film”, Indonesian J Pharm, vol. 32, no. 1, pp. 43-51, Jan. 2021.