1. S.P. Parker, Encyclopedia of Chemistry, 1982, McGraw-Hill Inc, New York, pp. 577–580.
2. E Habashi, Handbook of Extractive Metallurgy, 1997, vol. IV, Wiley-VCH, New York, pp. 1813–1860.
3. E Habashi, Principles of Extractive Metallurgy, 1986, Vol. 3, Gordon and Breach, London, pp. 104–110.
4. The Relative Transparency of Minerals to Microwave Radiation