Salehzadeh, Sadegh, and Hassan Keypour. “Synthesis and Characterization of Mn(II), Ni(II), Cu(II), Zn(II) and Cd(II) Complexes of HeptadentateAsymmetrical Tripodal Schiff Base”. Asian Journal of Chemistry, vol. 18, no. 2, Mar. 2010, pp. 1387-93, https://asianpubs.org/index.php/ajchem/article/view/21159.