et.al, Shawket K. Jawad,. 2017. “Solvent Extraction of Copper (II) from Aqueous Solutions by New Organic Reagent 2-[(3-Hydroxy phenyl)azo]-4,5- Diphenyl Imidazole”. Al-Qadisiyah Journal of Pure Science 18 (1), 66-80. https://journalsc.qu.edu.iq/index.php/JOPS/article/view/382.