1. Removing impurities to improve phosphoric acid quality: acid treatment, Phosphorous Potassium 14 (1987) 30.
2. M. Feki, Contribution to the phosphoric-acid purification of wet process by extraction with the methyl-isobutylcetone, thesis, University of Sciences, Tunis, May 2001.
3. Extractive purification of wet phosphoric acid with tributyl-phosphate: study of the impurities distribution;Dhouib-Sahnoun;J. Chem. Company Tunisia,2000
4. Comparison of liquid membrane processes for the removal of cadmium from wet phosphoric acid;Urtiaga;J. Membr. Sci.,2000
5. Aqueous hybrid liquid membrane process for metal separation. Part II. Selectivity of metals separation from wet-process phosphoric acid;Kislik;J. Membr. Sci.,2000