“The Electronic Transition Behavior Cr (III), Fe (III), Fe (II) and Ni (II), Transition Metal Cations In Ammonium Alum-Urea Room Temperature Ionic Liquid” (2013) Al-Nahrain Journal of Science, 16(3), pp. 46–55. Available at: https://anjs.edu.iq/index.php/anjs/article/view/576 (Accessed: 2 May 2024).