Badawi, M. . ., and E. . Suleiman. “Theoretical Study of Diels -Alder Reactions of Furan and Its Some Derivatives With Maleic Anhydride in Gas Phase”. Latakia University Journal -Basic Sciences Series, vol. 39, no. 5, Sept. 2018, https://journal.tishreen.edu.sy/index.php/bassnc/article/view/4014.