Vimala, T., and T.S. Jani Bai. “Effect of Substituent on The Oxidation of Some Heterocyclic Semicarbazones by Quinolinium Fluorochromate”. Asian Journal of Chemistry, vol. 22, no. 7, June 2010, pp. 5705-10, https://asianpubs.org/index.php/ajchem/article/view/11691.