Shafiq, Zahid, et al. “Synthesis of Metal-Based Analogues of Isonicotinoyl and Benzoyl Hydrazones and Their Antioxidant and Cytotoxic Activities”. Asian Journal of Chemistry, vol. 24, no. 10, May 2012, pp. 4623-8, https://asianpubs.org/index.php/ajchem/article/view/9723.