Ali ET, AL-Aliawy , KML, Tomma JH. Synthesis and Characterization of New Symmetrical Pyromellitdiimide Derivatives and Their Amic Acids. IHJPAS [Internet]. 2016 Dec. 29 [cited 2025 Apr. 3];24(3). Available from: https://jih.uobaghdad.edu.iq/index.php/j/article/view/833