MOHAMMAD-SALIM, H. A.; ABDALLAH, H. H. Theoretical Study of the [4+2] Cycloaddition Reaction of Trifluoroethylene with Five-membered Chalcogens Heterocyclic Compounds. ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, v. 7, n. 2, p. 69-77, 28 Dec. 2019.