Purnawan, C., E. T. Wahyuni, I. Kartini, and S. Suherman. “The Influence of the Simultaneous Addition of Fe2+ and Fe3+ on Changes in the Structural, Optical, and Electronic Properties of TiO2 Powder”. Trends in Sciences, vol. 23, no. 6, Jan. 2026, p. 12406, doi:10.48048/tis.2026.12406.