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Bahtiar S, Islam I, Jayatri AU, Widyawati F, Yanuar E. Fabrication of Fe3O4/PEG 4000/Oleic Acid Ferrofluids on Crystal Structure and Magnetic Properties Using Rhee Sumbawa Iron Sand . J. Pijar.MIPA [Internet]. 2025 Jan. 30 [cited 2025 Mar. 14];20(1):117-22. Available from: http://jurnalfkip.unram.ac.id/index.php/JPM/article/view/8108