S. I. Septiansyah, Herman, R. N. Hidayatulloh, and A. Rahmadita, “Study on TiO2 Extraction from Ilmenite Sand in Ketapang Regency Through Various NaOH Molar Ratios”, Eksplorium: Bul. Pus. Bang. BGN, vol. 47, no. 1, pp. 39–48, May 2026.