1. H. Sibum: in Titanium Handbook of Extractive Metallurgy, F. Habashi, ed., Wiley-VCH, Weinheim, 1997, vol. 2, p. 1140
2. P. Doan: TiO 2 2003 Intertech Conf., Miami, FL, 2003
3. J.A. Kahn: J. Met., 1984, vol. 36 (7), pp. 33–38
4. G.E. Viens, R.A. Campdell, R.R. Rogers: Trans. Can. Inst. Mining Met., 1957, vol. 60, pp. 405–10
5. A. Westerhaus and P. Woditsch: in Titanium Handbook of Extractive Metallurgy F. Habashi, ed., Wiley-VCH, Weinheim, 1997, vol. 2, p. 1145