1. R.J.H. Clark, The chemistry of titanium and vanadium, Elsevier, Amsterdam, 1968.
2. F.A. Cotton, G. Wilkinson, Advanced Inorganic Chemistry, A Comprehensive Text, 4th ed., Wiley, New York, 1980.
3. N.N. Greenwood, A. Earnshaw, Chemistry of the Elements, Pergamon Press, Oxford, 1984.
4. Chapter 4 Commercial Preparation and Characterization of FCC Catalysts
5. R.G. Burns, in: A. Putris, R.C. Liebermann (Eds.), Mineralogical Applications of Crystal Field Theory, 2nd ed., Cambridge University Press, Cambridge, 1993.