“Synthesis, Spectral Characterization and Biological Activity of S-Substituted Derivatives of 5-(4-Nitrophenyl)-1,3,4-Oxadiazole-2-Thiol”. Asian Journal of Pharmaceutical and Health Sciences, vol. 2, no. 3, Sept. 2012, pp. 370-6, https://www.ajphs.com/index.php/ajphs/article/view/644.