KRISHNA MURTHY.P, et al. “SYNTHESIS, CHARACTERIZATION AND ANTIMICROBISL STUDIES OF Cu(II), Pd(II), Fe(III) AND Mn(II) COMPLEXES OF TETRADENTATE N4 LIGAND”. International Journal of Pharma and Bio Sciences, vol. 4, no. 3, Sept. 2013, pp. 947-56, https://ijpbs.net/index.php/journal/article/view/2528.