Ainiyah, Nur, Susanti Erikania, and Rina Nurmaulawati. “Antioxidant Activity Test of Purified Extracts from Sea Lettuce (Ulva Lactuca L.) from Pidakan Pacitan Beach Waters Using the DPPH (1,1-Diphenyl-2-Picrylhydrazyl) Method”. Jurnal Farmasi & Sains Indonesia 6, no. 2 (January 11, 2024): 61-70. Accessed July 7, 2025. https://www.journal.stifera.ac.id/index.php/jfsi/article/view/172.