A. M. Saloom, A. A. . Fayad, and E. T. . Ali, “Novel Schiff Bases Derived From Pyromellitic Dianhydride”, IHJPAS, vol. 27, no. 3, pp. 479–492, Apr. 2017, Accessed: Nov. 22, 2024. [Online]. Available: https://jih.uobaghdad.edu.iq/index.php/j/article/view/313