Amangeldykyzy, A., Kopobaуeva A., N. Askarova, D. Ozhigin, and V. Portnov. “Study of Rare Earth Elements in the Coals of the Shubarkol Deposit”. Kompleksnoe Ispolzovanie Mineralnogo Syra = Complex use of mineral resources 319, no. 4 (October 13, 2021): 48–56. Accessed December 22, 2024. http://kims-imio.com/index.php/main/article/view/73.