1. The Potential to Produce Phosphate Rock.;Anon;Phosphorus and Potassium,1988
2. An Assement of Sulfur Recovery at Riyadh Refinery.;Al-Fariss,1987
3. Production of Wet-Process Phosphoric Acid.;Hignett;Proc. 2nd. Int. Cong., Phophorus Compounds,1980
4. Phosphates and Phosphoric Acid.;Becker,1983
5. The Evaluation of Phosphate Rock.;Leyshon,1980