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2. Anon (1979) in Proceedings of the Soviet-Swedish Symposium of the Beneficiation of Phosphate Rock (Academy of Sciences of the Estonian SSSR, Tallinn).
3. Removing impurities to improve phosphoric acid quality: rock beneficiation;Phosphorus & Potassium,1986
4. Selective flotation of dolomitic Florida phosphates;Phosphorus & Potassium,1991
5. Anazia I. J. Hanna J. (1990) in Advances in Fine Particle Processing, Sequential separation of carbonate and siliceous gangue minerals during phosphate ore processing, eds Hanna J. Attia Y. A. (Elsevier, New York), pp 357–367.