K. M. Daoud, E. Q. Mahmood, and M. Y. Salih, “Synthesis of Some 1,4-Bis (Substituted 1,3,4-Oxadiazoles and 1,2,4-Triazoles) Benzene From Terephthalic Acid”, EDUSJ, vol. 24, no. 3, pp. 51–60, Nov. 1999.