M. ABDULRASOOL, J.; T. ALI, E.; H. TOMMA, J. New Schiff – Bases Prepared From Pyromellitic Dianhydride Via Its Hydrazide Derivative. Ibn AL- Haitham Journal For Pure and Applied Sciences, [S. l.], v. 29, n. 1, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/59. Acesso em: 23 may. 2022.