“Synthesis and Characterization of Heterocyclic Seven Membered Rings from 2,3-Pyridine Caroboxylic Anhydride”. Ibn AL-Haitham Journal For Pure and Applied Sciences 29, no. 2 (March 13, 2017): 421–436. Accessed May 4, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/139.