“Synthesis and Characterization of Ag+ ,Pb+2 ,Fe+3 ,Cr+3 Complexes With the New Antipyrene – Azo Ligand”. Ibn AL-Haitham Journal For Pure and Applied Sciences, vol. 22, no. 2, Aug. 2017, https://jih.uobaghdad.edu.iq/index.php/j/article/view/1251.