1. F.C. Levey, M.B. Cortie, T. Biggs, and P. Ellis: Proc. Microsc. Soc. South Afr., 1998, vol. 28, p. 18.
2. I.M. Wolff and M.B. Cortie: Gold Bull., 1994, vol. 27, pp. 44–54.
3. I.M. Wolff and V.R. Pretorius: Gold Technol., 1994, vol. 12, pp. 7–11.
4. M. Cortie, I. Wolff, F. Levey, S. Taylor, R. Watt, R. Pretorius, T. Biggs, and J. Hurly: Gold Technol., 1994, vol. 14, pp. 30–36.
5. F.C. Levey, M.B. Cortie, and L.A. Cornish: J. Phys. IV, 1995, vol. C8, pp. 1087–92.