Sija, Juma, and Mohamed Mazunga. “Assessment of Viability of Coal Mines in Tanzania for Extraction of Rare Earth Elements”. Tanzania Journal of Science 49, no. 4 (October 27, 2023): 819–830. Accessed October 22, 2024. http://tjs.udsm.ac.tz/index.php/tjs/article/view/1571.