M. Daoud, K., K. Ahmad, A. and N. Ali, A. 2009. Synthesis of Some Substituted 1,3,4-Oxadiazoles from Hydrazones. Journal of Education and Science. 22, 3 (Sep. 2009), 11–18. DOI:https://doi.org/10.33899/edusj.2009.57755.