S. Bahtiar, F. . Widyawati, E. . Yanuar, R. . Ramadhan, K. . Zahra, and S. Hidayat, “Preparation of synthesis nanoparticles Fe3O4 based on iron sand Sumbawa ”, J. Pijar.MIPA, vol. 18, no. 6, pp. 959–963, Nov. 2023.