1. Phosphates and Phosphoric Acid, Raw Materials, Technology and Economics of the Wet Process;Becker,1989
2. Sulfuric/Phosphoric Acid Plant Operation, American Institute of Chemical Engineers, New York, 1982.
3. Atmospheric Emissions from Thermal Process Phosphoric Acid Manufacture, AP-48, US Environmental Protection Agency, Research Triangle Park, NC, October 1968.
4. Purification of Wet-Process Phosphoric Acid by Hydrogen Peroxide Oxidation, Activated Carbon Adsorption and Electrooxidation