Li, X., J. Li, Y. Jin, M. Chen, D. Feng, and Y. Guo. “Wet Process of Phosphoric Acid Purification by Solvent Extraction Using Tri-N-Butyl Phosphate and Cyclohexanol Mixtures”. Journal of the Serbian Chemical Society, vol. 82, no. 5, June 2017, pp. 579-92, doi:10.2298/JSC161028019L.