J. M. Abdulrasool, E. T. Ali, and J. H. Tomma, “New Schiff – Bases Prepared From Pyromellitic Dianhydride Via Its Hydrazide Derivative”, IHJPAS, vol. 29, no. 1, Mar. 2017, Accessed: Mar. 14, 2025. [Online]. Available: https://jih.uobaghdad.edu.iq/index.php/j/article/view/38