Mahmood. Aljamali, D. N. “Synthesis and Charactrization of Hetromacro Cyclic Compounds via Cyclization Reactions”. Al-Qadisiyah Journal of Pure Science, Vol. 19, no. 1, July 2017, pp. 91-102, https://journalsc.qu.edu.iq/index.php/JOPS/article/view/99.