Andrews, B., and Mansur Ahmed. “Novel Synthesis and Characterization of Some Pyrimidine Derivatives of Oxadiazoles, Triazole and 1,3,4-Thiadiazoles”. Asian Journal of Chemistry, vol. 25, no. 4, Nov. 2012, pp. 2070-2, doi:10.14233/ajchem.2013.13320.