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Theresih, K.; Budimarwanti, C.; Arty, I. S.; Handayani, S.; Ramadhani, N. P.; Kurniasih, R. Synthesis of ZnO Nanoparticles from Zink Acetate Using Red Betel and Bay Leaves Extract and It’s Application As Sunscreen. Indo. J. Chem. Env. 2021, 4, 31-38.