SHRIVASTAVA, SNEHIKA, et al. “Synthesis, Spectral and Biological Studies of Cu(II), Zn(II) and Cd(II) Complexes With Schiff Base Ligand”. Asian Journal of Chemistry, vol. 21, no. 9, Mar. 2010, pp. 7224-8, https://asianpubs.org/index.php/ajchem/article/view/12205.