Kumar, D. Sathis, et al. “Mononuclear Transition Metal Complexes Containing Quadridentate Schiff Bases As N2O2 Donors: Synthesis, Spectral Characterization Properties and Antibacterial Activity”. Asian Journal of Chemistry, vol. 28, no. 1, Oct. 2015, pp. 104-10, doi:10.14233/ajchem.2016.19259.