1. L.R. Nelson and R. Hundermark, Journal of the Southern African Institute of Mining and Metallurgy 2016, vol. 116, pp. 465-490.
2. J.D. Steenkamp, C.J. Hockaday, J.P. Gous and T.W. Nzima, JOM 2017, vol. 69, pp. 1712-1716.
3. A. Barcza, J.B. Koursaris and W.A. See, In 37th Electric Furnace Conference, (Detroit, 1979), pp 19–33.
4. M. Ksiazek, M. Tangstad and E. Ringdalen, In Silicon for the Chemical and Solar Industry XIII, (Kristiansand, Norway, 2016), pp 33–42.
5. E. Ringdalen and J. Eilertsen, In INFACON IX, (Quebec City, Canada, 2001), pp 166–73.