Ali, Ibtehaj Raheem, et al. “Extraction of Nickel (II) From Aqueous Solutions By Using 2-[ (4-Bromo Phenyl) Azo]-4,5-Diphenyl Imidazole”. Journal of Kufa for Chemical Sciences, no. 6, Feb. 2016, https://journal.uokufa.edu.iq/index.php/jkcs/article/view/3414.