Synthesis And Characterization Of (P-Hydroxybenzoic Acid Urea Formaldehyde) Copolymer Chelates With Pb(II),Zn(II) And Cd(II) Ions. JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences, [S. l.], v. 26, n. 3, p. 99–107, 2018. Disponível em: https://journalofbabylon.com/index.php/JUBPAS/article/view/566. Acesso em: 19 apr. 2025.