Ahmed, S. H., El Gammal, E. M., Amin, M. I., Yousef, W. M. “Studying the Effect of Potassium Amyl Xanthate Surfactant on Fe, Cu and U Ions for the Pretreatment of Abu Zeneima Sulphate Leach Liquor”, Periodica Polytechnica Chemical Engineering, 65(3), pp. 408–415, 2021. https://doi.org/10.3311/PPch.15795