Satpathy, K.C., et al. “Dinuclear Metal Complexes, Part IX, Copper(II), Nickel(II) and Cobalt(II) Complexes With a Schiff-Base Derived from-3-Formylsalicylic Acid and Carbohydrazide ”. Asian Journal of Chemistry, vol. 7, no. 2, Mar. 2010, pp. 243-52, https://asianpubs.org/index.php/ajchem/article/view/24272.