“The Electronic Transition Behavior Cr (III), Fe (III), Fe (II) and Ni (II), Transition Metal Cations In Ammonium Alum-Urea Room Temperature Ionic Liquid”. Al-Nahrain Journal of Science 16, no. 3 (September 1, 2013): 46–55. Accessed November 22, 2024. https://mail.anjs.edu.iq/index.php/anjs/article/view/576.