“Synthesis, Structural and Biological Efficiency Studies of New Azo Ligands and Their Complxes With Zn(II), Cd(II) and Hg(II) Metal Ion”. Ibn AL-Haitham Journal For Pure and Applied Sciences, vol. 28, no. 3, Mar. 2017, pp. 169-86, https://jih.uobaghdad.edu.iq/index.php/j/article/view/151.