Zulkarnain, Abdul Karim, and Jumina Jumina. “Optimization of Carbopol, CMN-Na, Gelatin, and In Vitro Activity Test of 4-Hydroxy Chalcone Gel As Sunscreen ”. Journal of Food and Pharmaceutical Sciences 11, no. 2 (June 8, 2023): 803-811. Accessed November 23, 2024. https://dev.journal.ugm.ac.id/v3/JFPS/article/view/8237.