Mutar, M. A., and M. H. Abdul-Nebi. “Synthesis and Characterization of Novel Aromatic Polyamides Containing Pyridine Heterocyclic Ring and Schiff-Base”. Al-Qadisiyah Journal of Pure Science, Vol. 19, no. 3, July 2017, pp. 44-72, https://journalsc.qu.edu.iq/index.php/JOPS/article/view/145.