Nurpeisova, Z., and E. Zlobina. “Extraction Separation of Scandium and Rare Earth Metals-Impurities by Trioctylphosphineoxide Solution in Kerosene”. Chemical Bulletin of Kazakh National University, Vol. 74, no. 2, Aug. 2014, pp. 29-34, doi:https://doi.org/10.15328/chemb_2014_229-34.