Bui, Q. T. et al. (2019) “Practical Study of Purification of Lao Cai Wet Process Phosphoric Acid, Based on Tributyl Phosphate (TBP) – Kerosene Mixture Solvent Extraction”, Old Journal, (134A), pp. 6–10. Available at: https://jst.vn/index.php/old/article/view/648 (Accessed: 2 August 2025).