Agustin, Rini, et al. “Formulation of Anti-Blackhead Rubber Mask from Purified Gambier (Uncaria Gambir [Hunter] Roxb.)”. Jurnal Sains Farmasi & Klinis, vol. 10, no. 3, Dec. 2023, pp. 340-7, doi:10.25077/jsfk.10.3.340-347.2023.