1. H. Derek, K. Rose, S. Viljoen, and A. Mulaba-Bafubiandi, Mineral. Petrol. 112, 881 (2018).
2. R.G. Cawthorn, H.V Eales, F. Walraven, R. Uken, M.K. Watkeys, The Bushveld Complex (The Geology of South Africa, Johannesburg/Council of Geoscience, Pretoria 2006) pp. 261-282.
3. C.A. Lee, Dev. Petrol 15, 103 (1996).
4. I.J. Geldenhuys, The thirteenth International Ferroalloys Congress Efficient Technologies in ferroalloy industry, Almaty, Kazakhstan, Vol. 9 (2013).
5. K. Yildiz, and I.A. Sengil, Scand. J. Metall. 33(4), 251 (2004).