Malisa , E. P. “Petrography and Mineral Chemistry of the Pelitic and Semi-Pelitic Gneisses of the Merelani Tanzanite Mining Area, Northeastern Tanzania”. Tanzania Journal of Science, vol. 31, no. 2, Apr. 2021, pp. 81-92, https://tjs.udsm.ac.tz/index.php/tjs/article/view/440.