Saputra, K., 		Inayah, R., 		Aminy, I., 		Ardianto, T., & 		Kurniawidi, D.
(2025).
 Electronic Properties of Fe3-xCoxO4 (x = 0.25 and 0.375) Synthesized from Natural Iron Sand: Evaluation of Band Gap and Urbach Tail.
<em>Jurnal Teras Fisika: Teori, Modeling, Dan Aplikasi Fisika, 8</em>(2), 23-34.
doi:10.20884/1.jtf.2025.8.2.17580