Navudu, Ramesh, et al. “Synthesis, Characterization and Keto-Enol Tautomerism of Novel 2-(Trifluoromethyl)benzohydrazide Derivatives”. Asian Journal of Chemistry, vol. 28, no. 6, Feb. 2016, pp. 1351-60, doi:10.14233/ajchem.2016.19703.