M. Abdulrasool, J., T. Ali, E., & H. Tomma, J. (2017). New Schiff – Bases Prepared From Pyromellitic Dianhydride Via Its Hydrazide Derivative. Ibn AL- Haitham Journal For Pure and Applied Sciences, 29(1). Retrieved from https://jih.uobaghdad.edu.iq/index.php/j/article/view/59