“Synthesis and Characterization of New Chelating Terpolymer Resin Derived from p-Amino Benzoic Acid, Biuret and Formaldehyde and Study Efficiency Extractive from Some Metal Ion” (2017) Ibn AL-Haitham Journal For Pure and Applied Sciences, 30(1), pp. 384–399. doi:10.30526/30.1.1087.