Haghgooie, Hossein, and Maryam Saket Oskoui. “Synthesis and Characterization of Some New Schiff Base Ligands and Their Complexes With Cobalt(II), Nickel(II) and Copper(II)”. Asian Journal of Chemistry, vol. 20, no. 8, Mar. 2010, pp. 6081-9, https://asianpubs.org/index.php/ajchem/article/view/13061.