B. Mahapatra, Bipin, et al. “Polymetallic Complexes : Part XXXVI &Mdash; Z - Donor Bis-Bidentate Chelating Azodye Complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) ”. Asian Journal of Chemistry, vol. 4, no. 4, Mar. 2010, pp. 873-8, https://asianpubs.org/index.php/ajchem/article/view/25164.