Janaki Rama Rao, R., et al. “Synthesis and Antimicrobial Activity of Novel 7-(Heteroaryl)-1,2,4-triazolo[1,5-A]-Pyrimidine Derivatives”. Asian Journal of Chemistry, vol. 24, no. 4, Dec. 2011, pp. 1837-43, https://asianpubs.org/index.php/ajchem/article/view/8890.