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Zulkarnain, A.K., Jumina, J., Kharismawati, G.T. and Larasati, F.A. 2023. Optimization of Gelling Agent and Sunscreen Activity Test of 4-OH-chalcone Gel by In Vitro Method. Indonesian Journal of Pharmacy. 34, 1 (Jan. 2023), 112-119. DOI:https://doi.org/10.22146/ijp.3300.