Spectroscopic Study for Resonance Effects on the Carbonyl Double Bond Order in Urea Schiff Bases Which Contain Conjugated System. Baghdad Sci.J [Internet]. 2011 Sep. 4 [cited 2025 Jul. 22];8(3):711-6. Available from: https://bsj-ojs.uobaghdad.edu.iq/index.php/BSJ/article/view/1281