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 2024 May 1];8(3):711-6. Available from: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/1281