H. L. Sarira, J. F. Suparningtyas, and H. Herman, “Optimasi Basis Carbopol dan Uji Fisik Basis Gel Anti Jerawat: Optimization of the Carbopol and Physical Testing of the Anti-acne Gel Base”, Proc. Mul. Pharm. Conf., vol. 15, no. 1, pp. 89–93, May 2022.