N.G. Lokhova, Zh.A. Baltabekova, M.A. Naimanbayev, A.A. Yessengaziyev and K.K. Kassymzhanov. 2020. “Extraction of Rare-Earth Metals from Zircon Concentration Tailings”. International Journal of Advanced Science and Technology 29 (9s), 893 -99. http://sersc.org/journals/index.php/IJAST/article/view/13345.