L. Listiawati, R. W. Astroha, and A. Sunandar, “Optimization of Ilmenite Conversion to High-Purity Titanium Dioxide (TiO₂) in the Ternary System TiO₂-Fe₂O₃-Na₂O”, Mekintek, vol. 16, no. 1, pp. 29–37, Apr. 2025.