B. Bihari Mahapatra and R. Sendha, “Polymetallic Complexes, Part LXXIII: Complex of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Hg(II), Mn(II) and Fe(II) with NOON donor Bis-bidetate Chelating Azodye Ligands”, ajc, vol. 12, no. 4, pp. 1061–1066, Mar. 2010.