“Spectroscopic Study for Resonance Effects on the Carbonyl Double Bond Order in Urea Schiff Bases Which Contain Conjugated System”. Baghdad Science Journal 8, no. 3 (September 4, 2011): 711–716. Accessed June 19, 2025. https://bsj-ojs.uobaghdad.edu.iq/index.php/BSJ/article/view/1281.