Synthesize and characterization of p-hydroxybenzoic acid urea formaldehyde Copolymer chelats with( Ca(II),Sr(II) and Ba(II) )ions . مجلة ديالى للبحوث الانسانية, Iraq, v. 1, n. 37, p. 240–249, 2022. DOI: 10.57592/djhr.v1i37.1497. Disponível em: https://djhr.uodiyala.edu.iq/index.php/DJHR2022/article/view/1497. Acesso em: 13 2025.