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2. Laporte Industries Ltd. British Patent 1 392 441, (1975).
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4. A model for the recovery of titanium from mixtures of ilmenite and hematite by hydrochloric acid leaching;Liddell;Separation Science and Technology,1988
5. Personal communication with David Williamson, Tioxide West-Site, Haverton Hill Road, Billingham, UK. (1994).