Quyền, Phạm, Đỗ Hân, Nguyễn Hậu, and Lê Trí. 2021. “Preparation of Cough Syrup Containing Dextromethorphan HBr, Promethazine HCl and Preliminary Assessment of Formulation Stability”. Science and Technology Development Journal: Health Sciences 2 (2), 214-21. https://doi.org/https://doi.org/10.32508/stdjhs.v2i2.474.