Prasad, Nagenra, et al. “Studies on Arylhydrazones, Part-XIV: Reduction of Diethyl Mesoxalate-O-Nitrophenylhydrazone ”. Asian Journal of Chemistry, vol. 10, no. 1, Mar. 2010, pp. 64-70, https://asianpubs.org/index.php/ajchem/article/view/23551.