1. D. F. Stewart L. J. Pollard “Process of Beneficiating Titaniferous Ores in the Presence of Hydrogen Chloride 1974
2. D. F. Stewart L. J. Pollard “Process for Producing Metallic Iron Concentrates and Titanium Oxide Concentrates from Titaniferous Ores 1974
3. L. J. Pollard D. F. Stewart “Beneficiation of the Non-Ferrous Metal Values of Oxide-Containing Materials 1977
4. 2015